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The Planetary Accounting Framework: a novel, quota-based approach to understanding the impacts of any scale of human activity in the context of the Planetary Boundaries



Human impacts on the environment are so great that we are at risk of changing the state of the planet from one that is hospitable to one that is hostile to humanity. Scientists have proposed nine Planetary Boundaries, global environmental limits within which the risk of changing the state of the planet is low, but already, four have been exceeded.

Policy makers and scientists want to use the Planetary Boundaries as a tool for global environmental management. However, the Boundaries were intended as a gauge of the magnitude and urgency of the situation, not as a guide to resolving it. They are not easily applied to personal or policy action that is measurable or scalable. Here we show how the Planetary Boundaries can be translated into a framework for the management of the global environment, the Planetary Accounting Framework.


The Planetary Accounting Framework is a new approach to environmental accounting in which environmental impacts are compared to global limits, the Planetary Quotas. The Planetary Quotas are limits for human activity, derived from the Planetary Boundaries. Each Quota is a limit for an “environmental currency” such as carbon dioxide emissions, or reforestation that can be scaled and compared to human activity using existing environmental assessment frameworks.

The Quotas and Framework were developed by combining three key theories. Management theory shows that a multi-level, poly-scalar approach is needed to manage the global environment. Accounting theory highlights the importance of accounting against limits if a realistic approach to achieving change is sought. Environmental accounting theory demonstrates that there are different categories of indicators, and that only if indicators are uniformly in the pressure category can human activity be related to a limit and scaled accordingly.


The Planetary Accounting Framework shows how individual actions, strategies by firms, city level infrastructure, and national policies can be expressed in terms of the Planetary Boundaries. Decisions can now be made at different levels or sectors regarding policy, planning, technology, business operations, legislation, and behaviour in the context of global environmental limits. It enables the practical application and communication of the Planetary Boundaries to different scales of human activity.

Video abstract. (MP4 600 kb)


The sum of the planet’s physical, chemical and biological processes is known as the Earth system. The Earth system comprises many interconnected processes (such as evaporation, transpiration, and photosynthesis) that store, transfer, and transform matter and energy according to the laws of physics and biogeochemistry [1].

When Earth system processes are in balance, the Earth system can operate in a particular state for many thousands of years. However, major disturbances to Earth-system processes can lead to an abrupt change of state. The transition from the most recent glacial period – the Younger Dryas – is an example of how rapid the change can be. Some regions are believed to have experienced more than 10 °C of warming in a single decade [2].

Homo sapiens evolved approximately 300,000 years ago [3]. For more than 280,000 years, humans subsisted as hunter gatherers who moved to suitable areas where they could survive. The Holocene is the period of time which began approximately 11,650 years before present (taken as the year 2000) [2]. The relatively warm and stable temperatures in the Holocene epoch saw the rapid development of humans from hunter gatherers to urban and agricultural settled societies [4, 5]. The state of the planet during the Holocene – henceforth referred to as a Holocene-like state – is the only environmental state of the planet in which we know settled societies can thrive [4, 5].

Scientists believe that the Holocene is over [4, 6, 7]. They believe we are in the transition to a new epoch, the Anthropocene, which roughly translates to “the human era” [6]. The state of the planet during the Anthropocene is yet to be determined; it could be a Holocene-like state, or it could be a much warmer state. A warmer Anthropocene is unlikely to occur through gradual and linear change [8]. Predictions are for non-linear, rapid, and potentially irreversible and sustained change to the climate and biosphere: substantial loss of species, devastating storms, significant sea level rise, and considerable displacement of communities [9].

There are external factors which could change the state of the planet that are beyond human control, for example, the output of the sun, or the shape of Earth’s orbit around it [10]. However, without human influence, the stable Holocene period would be expected to continue for at least several thousand [4] to as many as 50,000 more years [11]. Human activity over the next 50–100 years will most likely determine the state of the planet during the Anthropocene. Human activity is the only factor affecting the state of the planet that is within our control, and the Holocene is the only state of the planet in which we know humans can thrive. It seems prudent to attempt to manage human activity such that we can retain a Holocene-like state of the planet during the Anthropocene.

In 2009, Rockström et al. [5] proposed nine Planetary Boundaries, limits for Earth-system processes within which the risk of departure from a Holocene-like state is low [4] (see Table 1). Together these Boundaries define a “safe-operating-space” for humanity [4].

Table 1 Summary of the Planetary Boundaries (adapted from Steffen et al. [12], Table 1)

We have already exceeded four of the Planetary Boundaries [12]. The Planetary Boundaries show us that we are living outside the safe operating space, providing a gauge of the magnitude and urgency of the situation. The problem is, how to resolve this? As shown later in this paper, the PBs as stated do not translate into their significance for community, business, and policy.

This paper sets out how to do this using three key theories that are integrated into a way of managing the Planetary Boundaries and are expanded in the main text:

  1. 1.

    Management theory shows that the most effective approach to managing the Earth system is likely to be a poly-scalar approach, i.e., one that can be applied in different ways, across different areas of society, and at different scales, which is coordinated by a general system of rules.

  2. 2.

    Accounting theory highlights the importance of standards or limits in generating change.

  3. 3.

    Environmental accounting theory demonstrates that the type of indicator selected is critical to the applicability to policy and behaviour applications, in this case it highlights the need to convert the PB’s into pressures on the environment.

The purpose of this paper is to introduce a new paradigm - the Planetary Accounting Framework – based on the Planetary Quotas, that will help to make the Planetary Boundaries accessible and actionable. The Planetary Quotas are limits for human activity which are derived from the Planetary Boundaries. They show what is needed to return to and live within the safe operating space. The three theories set out above enable the overlap of three areas: LIMITS (Planetary Boundaries), CHANGE (poly-scalar management) and PRESSURES (environmental accounting) to create the novel concept of the Planetary Quotas (Fig. 1). These are therefore following the Sustainable Earth approach of how science, the Planetary Boundaries, can be related to both policy and community.

Fig. 1
figure 1

The Integrated Approach to Developing the Planetary Quotas

The Planetary Quotas form the foundations of the Planetary Accounting Framework (PAF). The PAF is a framework that shows how to apply the PQs. As shown in Fig. 2, this framework provides the platform for behavioural, policy, technological, and organisational change.

Fig. 2
figure 2

The Planetary Quotas form the foundations of the Planatery Accounting Framework; a platform for change

The paper begins with an overview of the three theories described above which together provide an integrated approach to change with respect to the Planetary Boundaries. We then show how the Planetary Quotas can be derived from the Planetary Boundaries with a brief description of how each of the Planetary Quotas was determined. This is followed by an overview of the PAF and how this can be used to shape policy and personal action. The paper ends with a discussion on the potential opportunities and constraints of the PAF and an overview of proposed future work on how to demonstrate the use of the PAF at different levels of human activity.

Theory 1: Poly-scalar management: An approach to managing the Earth system

The task of managing the Earth system is not straightforward. In the past, most theories on how best to manage shared resources (such as forests, fisheries, or the atmosphere) led to the conclusion that top-down governance or private management were the only effective options [13,14,15]. These theories were based on simple game theory that used the underlying assumptions that people would always act to maximise personal gain, regardless of the greater good [13,14,15]. The “tragedy of the commons” is that logic will drive humans to continue to overuse resources for immediate personal gains until everyone loses [14]. These theories do not do justice to how communities actually work and how social science now understands the way human activity can change [16,17,18,19,20]. Cultures and communities are formed to enable broader goals to be pursued that enable more than individualistic gain. The question then is, if top-down governance and private action do not address our understanding of social science and change, what sort of global environmental management structures would be more effective?

Managing human impacts on the environment means managing human behaviour. This might mean the day to day behaviour of an individual, or the decisions made by a CEO, or government official, or a member of the community. Studies based on observed behaviour show that there are many factors which influence decisions and that behaviour is very difficult to predict [21,22,23]. Lifestyle, position within a family, within society, or at work, culture, motivations, past behaviours, habits, social norms, context, and technology all play a role [21, 22, 24]. In the past, behaviour change efforts have typically been targeted at community and personal values, and social norms [24]. The findings that technology and context are key elements that influence decision making highlight the importance of infrastructure and technology and therefore governance and industry in driving pro-environmental (or other) decisions. As an example of how this can work, social media has been found to be an unintended driver for younger generations to switch from private to public transport as public transport allows them to stay connected to their peers during commuting time [25].

Nobel Prize winner Eleanor Ostrom began a movement in 1990 which used observed behaviour to dispute the validity of the theory of the commons altogether [16,17,18,19,20]. She and others showed through empirical evidence that the theory that individuals and small groups will not change their behaviour without external enforceable rules is far from inevitable [16, 26,27,28,29,30,31,32,33]. Community can shape the future through mutually accepted regimes of behaviour. In some instances these self-organised regimes have proved more effective than would have been feasible in the case of private action or top-down governance [18, 34]. Ostrom’s theory was that the most important factors which lead to cooperative behaviour by individuals towards the environment are the trust that the behaviour will lead to long-term benefits, and the belief that the majority of others are performing the same behaviour [35]. She thus proposed a poly-centric approach for managing global environmental issues like climate change, as one which is coordinated by a general system of rules, but which enables different centres of activity to take different approaches towards the same end. The different approaches include private action, self-organisation or community-based activity, and government action at all scales. The general system of rules is included as a mechanism to impart trust in the long-term benefits of the actions, and that others are contributing to the same goal.

The science of change supports and extends the findings that different scales of activity are important and that not only community but also infrastructure and technology are key to driving change. The “magic of sustainability” is the idea that integrative solutions of community, business and government, can far exceed the sum of their parts (Fig. 3) [36]. Specifically, when long-term community values and ethics overlap with mid-term government regulations and infrastructure and short-term business innovations, highly innovative and effective solutions which help to drive change can occur. Another insight from change theory is the importance of agents of change – individuals who create change in society – for example Rosa Parks – the black lady who refused to give up her seat in the white area of a bus and became a major catalyst for the movement for black rights.

Fig. 3
figure 3

The Magic of Sustainability (adapted from [36])

Drawing from these theories, we propose that the most effective approach to change is likely to be one that can be used even more broadly than Ostrom’s poly-centric approach. We propose a poly-scalar approach and define it as one which is:

integrative across different scales, sectors, and timeframes, that is not controlled by a single body, but which could be implemented through government, private ation, or self-organised management, that is coordinated by a general system of rules which have different mechanisms at different centres of activity.

Just like all management, environmental management works better when it engages people in the required activities [37, 38]. Global environmental problems are typically caused by a multitude of actions which take place at a small scale [35, 39]. Household environmental impacts (including impacts of transport and upstream impacts of goods and services acquired by households) can account for as much as 70–80% of the economy’s environmental loads [40]. Given the diverse nature of the causes of global issues, global or even national policies can miss local opportunities for change [39, 41]. People also tend to be more open to change implemented by local communities, businesses, organisations and authorities where plans have been developed with the specific community in mind, than to national level schemes [39, 41]. On the other hand, small-scale or local initiatives alone would be insufficient to manage a global problem such as climate change as many opportunities to reduce impacts rely on decisions which can only be made at a larger scale [39]. Although the literature on behaviour change shows mixed results there is powerful evidence that when design and technology are changed to focus on the appropriate scale, then the results can be positive [24, 42,43,44].

Benefits of a poly-scalar approach to managing the Earth system include:

  • the possibility for immediate action at different scales – rather than a need to wait for global accord,

  • the facilitation of widespread experimentation and learning at multiple scales – rather than the need to determine an effective approach prior to rolling out global initiatives,

  • the flexibility to encompass different centres of decision-making which are formally separate – creating a bridge that is necessary to achieve change [45], and most of all

  • the ability to engage people in whatever scale of activity they can focus on.

One might argue that there is already a poly-scalar approach to managing the Earth system underway. There are efforts to reduce impacts at different scales and sectors and using different approaches. What is missing from the current approach is the “general system of rules” – the common goal for this multitude of activities. Without a common goal, efforts are piecemeal. Targets for environmental initiatives range enormously, from those aiming for a very loosely defined state of “sustainability”, to those working towards a circular economy, or others directing their efforts towards reducing their ecological footprint [46,47,48,49]. This can lead to a sense that environmental initiatives will make little difference to the final outcome. Moreover, many people lack confidence that others are working towards the same end.

Thus, global management theory needs to be applied to global environmental management and, in particular, the scale at which most people are engaged must be clarified. It is these poly-scalar approaches that lead to changes in design, technology, regulations, and hence behaviour [24, 44]. Such an approach would likely help to resolve the many issues inherent in managing globally shared resources and create opportunities for meaningful change.

Theory 2: Accounting theory – Creating a shared empirical basis for different environmental issues

Accounting theory highlights the importance of measuring and monitoring assets and flows in order to make informed decisions. These decisions are strongly influenced by the limits or standards that have been set on the products or services that firms and organisations are trying to bring to market. Governments, private organisations, and households alike make informed decisions and choices based on their knowledge of the state of their assets, of incoming and outgoing cashflow and the limits or standards that are guiding their behaviour. Environmental accounting translates these insights from accounting theory to the management of environmental impacts.

Environmental Impact Assessment (EIA) is the quantification of environmental damage from human activity. Environmental accounting is the measurement and monitoring of environmental impacts over time, and often against targets that can be standards or limits required to be met. Environmental accounting is a critical element in managing the impacts of human activity on the environment. It is now possible to estimate the environmental impacts of not only past and present but also future activities with increasing levels of accuracy. Thus, decision making, planning, policy and legislation can all be made with some understanding of the corresponding environmental implications. For this reason, environmental accounting is common practice for many businesses, cities, and nations and can also be done for individuals, groups of people, or products and services.

Environmental limits or standards are not new, for example the use of environmental footprints and/or life cycle assessments to help manage the global environment is commonplace. An example is the Ecological Footprint, a measure of human use of natural capital compared to the corresponding biological capacity – or available natural capital. This framework is used to assess the impacts of most nations [50], and has been used in other smaller scale applications such as the development of an online personal impact calculator [51]. The Ecological Footprint is just one of many footprint tools. In one study of environmental footprints, 32 different footprint indicators were identified [52]. In acknowledgement that environmental footprints do not give a holistic picture of sustainability, some authors have proposed “footprint families” which are typically comprised of carbon, ecological, and water footprints [53,54,55,56].

The primary shortcoming of using environmental footprints, footprint families, and environmental accounting in general to manage impacts is that the results are rarely given in the context of science-based targets [57, 58]. Targets are often self-selected. They are typically based on a percentage improvement from a previous reporting period, sectoral commitments (for example national commitments to meet carbon targets) or using sectoral or industrial benchmarks.

There are several reasons that the lack of science-based targets is important. To begin with, incremental targets typically lead to incremental improvements (as opposed to systemic changes – i.e., change to the entire system). Incremental improvements are unlikely to be sufficient to return us to the safe operating space. Moreover, incremental improvements are criticised for their rebound effect [59,60,61]. The rebound effect is the phenomenon that as one area of a system improves, people feel more able to relax in other areas of the system offsetting the initial improvements, or even resulting in a worse outcome. For example, a person looking to lose weight might go for a 20-min run. At the end of the run, she may feel that she deserves a treat to reward her efforts and eat a chocolate bar. The calories in an average chocolate bar are higher than most people would burn during a 20-min run. The net result of the run would thus be an increase in net calorie intake.

Incremental targets are less conducive to ongoing behaviour change than absolute targets [58]. They indicate that the status quo is bad, and that we must continually reduce and improve. In contrast, science-based targets present a vision of the end goal. This allows a fundamental switch in conversation from negative conversations about the status quo, to hopeful conversations about a positive future. Studies of behaviour have shown that visions of a hopeful future are more useful to generate change than scare tactics about the status quo [22]. Absolute targets do not negate the importance of incremental improvements. These are the basis of most personal and policy change [42] and can be used to implement systemic change towards an end goal.

Carbon accounting is a strand of environmental accounting where global limits are often considered. There are debates as to a “safe” level of global warming and therefore maximum allowable CO2 emissions. Nonetheless it is possible to link CO2 emissions for an activity with a global budget based on scientific knowledge.

Carbon accounting has led to widespread understanding of what is a relatively complicated scientific problem. It is used across different sectors and at different scales of activity. Individuals and communities can calculate their “carbon footprint” – the amount of CO2 released due to the activities of the individual or community. Formal greenhouse gas accounting protocols have been developed for nations, cities, and products and services eg. [62, 63]. CO2 emissions have been translated into dollar values. Studies have been completed to assess the relative benefits of a carbon tax versus carbon trading. Different approaches for managing emissions and different technologies for reducing emissions or absorbing carbon from the atmosphere have been trialled in different locations and at different scales allowing for a very rapid uptake of knowledge and development.

Carbon accounting is a remarkable example of the importance of limits. These efforts at every scale have already led to some success. Economic growth has been decoupling from greenhouse gas emissions since 2000 [64]. From 2014 to 2016 there was almost no increase in greenhouse gas emissions [65]. In 2017 emissions rose to a new peak [66]. It is disappointing that peak emissions have not yet occurred. However, trends over the last decade still appear promising. Implementing a poly-scalar approach with clearly defined global targets could help to increase the trust that efforts at every scale will make a difference to the end goal, and that others are working towards the same end.

In summary, to better manage the global environment, results of environmental impact assessments should be compared to absolute limits rather than incremental targets. We can use such an approach to drive systemic change. The PBs are absolute global limits. However, they cannot easily be connected to environmental impact assessments.

Theory 3: The DPSIR environmental accounting framework and accessible indicators

Several authors have highlighted the opportunity for the Planetary Boundaries to reform environmental governance at multiple scales e.g. [45, 58, 67]. Several efforts have already been made to use the PBs for environmental accounting at different scales. For example, there have been several attempts to link the PBs to existing environmental assessment frameworks including footprint tools and life-cycle assessments [68, 69]. National targets have been developed based on the PBs for Switzerland, Sweden, and South Africa, and regional targets for the European Union, and environmental accounting against these targets has begun [70,71,72]. However the work is disjointed and incomplete.

The PBs as designed by the planetary scientists who first proposed them, were not intended to be disaggregated or scaled [12]. The purpose of the PBs was to provide a clear snap shot of the status quo of critical Earth-system processes based on how these systems are measured globally. They do not define limits for human activity.

Each of the works adapting or scaling the PBs and using these for environmental accounting has severe limitations. To begin with, none of them correspond to the PB for climate change. There is a wide variation in the indicators selected for biosphere integrity. So much so that it would be very difficult to contrast and compare any of the limits with one another or with the original PB. More importantly perhaps, none of the adaptations are suitable for use beyond the application for which they were intended. The national indicators developed would be difficult to apply to city or regional levels or to translate into business targets. This means that even within that nation, different levels of activity would be working towards different targets. The level of effort that has gone into each of the adaptations is high. It would not be practical to repeat such an involved process for every intended use. None of the adaptations are suitable for a poly-scalar approach.

The Driver-Pressure-State-Impact-Response (DPSIR) framework is used below to show why the Boundaries cannot easily be scaled or used in environmental accounting as they are. In response to the vast number of environmental indicators developed for environmental impact assessments, a system to categorise these was adopted by the European Environment Agency – the DPSIR framework, detailed in Fig. 4 [70, 72, 73]. The DPSIR framework not only enables the classification and therefore better understanding of indicators, it can also be used to translate indicators from one category to another as there is a causal relationship between each category [73]:

  • Driver indicators describe human needs. Some examples of Driver indicators include kilowatt hours of electricity, kilometres travelled, or litres of fuel for transport.

  • Pressures which result from drivers are flows to the environment. One Pressure indicator resulting from the Driver indicators listed is CO2 emissions.

  • State indicators describe the environment. State indicators provide a snapshot of the status quo. Comparing the current State of a given ecosystem to a previous State allows us to understand the influence of human activity on the environment. For example, the change of the State indicator which corresponds to CO2 emissions – the concentration of CO2 in the atmosphere – has allowed us to understand the ramifications of emitting CO2. It is this sort of indicator that is commonly used in State of the Environment Reporting.

  • Impact indicators describe the results of changing environmental States. For example, one of the Impacts of the increased concentration of CO2 in the atmosphere is an increase in average global temperature. Another Impact is species extinctions.

  • Response is not a category of indicator. Rather it is included in the framework to show that different types of responses can be linked to different categories of indicators (see Fig. 4)

Fig. 4
figure 4

The Driver Pressure State Impact Response Framework

Human activity directly influences Pressures and Drivers and only indirectly influences States and Impacts. This means that State and Impact indicators are useful to describe the status quo, and to monitor change over time. However, they cannot be easily related to human activity. There is no straightforward way to divide the responsibility for the concentration of CO2 in the atmosphere between different nations, cities, regions, or individuals unless a different indicator can be found that is easily scaled. Nor can one directly compare specific human activities to the global average temperature. An individual deciding whether to take the car or the train to work, or a local government deciding whether to proceed with certain infrastructure – neither could begin to estimate the impacts of these decisions on the atmospheric concentration of CO2. It is only when these indicators are translated to the Pressure indicator – CO2 emissions, that it becomes possible to begin to allocate this global budget between nations, cities, or any other level.

Table 2 shows how each of the Planetary Boundary control variables fits into different DPSIR framework categories. There are three Pressure indicators, five State indicators, and one Impact indicator – i.e., the indicators do not all belong to a single category. This explains the reason why the Planetary Boundaries have not easily been translated into action.

Table 2 Driver-Pressure-State-Impact-Response (DPSIR) classification of the Planetary Boundary control variables

For a poly-scalar approach to be applied to the Planetary Boundaries, a new set of Pressure indicators, derived from the PBs, is needed. We have called these the Planetary Quotas (PQs). Each of these are set out below. Once derived the PQ’s can then enable us to link human activity to key global limits through the Planetary Accounting Framework.

Developing the Planetary Quotas

Some authors have identified the opportunity to use the DPSIR framework to determine a causal relationship between human activity and the Planetary Boundaries [70, 72, 74]. Two of the national adaptations of the PBs use a methodology based on the DPSIR framework [70, 72]. However, neither study applied this approach across all of the PBs. Nor did either propose a set of indicators that were uniformly of the Pressure category.

The Planetary Boundaries are presented as distinct control variables with explicit limits. This is by design to make them easily communicable [12]. In reality, there is a high level of interconnectivity between the PBs. For example, almost every PB affects biosphere integrity. Exceeding one PB affects our ability to remain within others.

For the PQs to be a robust translation of the PBs, this interconnectivity must be carried over to the PQs. It would not be suitable to translate each PB to a PQ without consideration of all of the other PBs and PQs. To manage this, the method used was to first translate each of the PBs into a list of critical pressures based on the scientific literature (see Additional file 1: Table S1), and then from this list, PQs were developed.

There are many pressures which only have minor contributions towards the PBs, so an exclusion protocol was applied for pressures which contribute less than 1% towards current global impacts. Excluding minor impacts is common practise in environmental assessment protocols as a means to simplify the process with minimal effect on the results [75]. In total, thirty-two critical pressure were found. These were then analysed to determine which of the pressures could be grouped, and to find appropriate Pressure indicators to assess these with. The result was ten Pressure indicators which formed the basis of the PQ development.

Each of the PQ indicators found corresponds to one or more of the critical pressures and therefore one or more PB(s). The PQ limits were thus determined by assessing each of the corresponding PBs and selecting the most stringent limit.

The translation of the PBs to pressures and then to PQs is shown in Fig. 5. The direct relationship between the PBs and PQs is shown in Fig. 6. Two of the Planetary Boundaries have previously been identified as “core boundaries” for their high level of interconnectivity – Climate Change and Biosphere Integrity [12]. Each of these correspond to more than half of the Planetary Quotas (see Fig. 6).

Fig. 5
figure 5

Translating Planetary Boundaries to Critical Pressures and then to Planetary Quotas

Fig. 6
figure 6

The relationship between the Planetary Boundaries and Planetary Quotas

The PQs are summarised in Table 3. The scientific basis for each PQ is described briefly below. More detailed descriptions are included in the Supplementary Information where needed.

Table 3 The Planetary Quotas

A quota for carbon dioxide emissions

Carbon dioxide (CO2) emissions is a critical pressure which affects several of the PBs (see Additional file 1). The PB that translates to the most stringent PQ for CO2 is the PB for the concentration of CO2 in the atmosphere of ≤350 ppm. The concentration of CO2 in the atmosphere is currently ≥400 ppm, i.e., this PB has been exceeded. No other pressures were grouped with CO2 for this PQ because the only way to meet the PB for CO2 concentration is through the uptake of CO2 from the atmosphere. The indicator selected for this PQ is thus net carbon dioxide emissions; net because to return to 350 ppm will require uptake of CO2 from the atmosphere.

There are several pathways for rapid decarbonisation in the literature e.g., [76,77,78,79]. However, only one of these shows the concentration of CO2 in the atmosphere as returning to 350 ppm within this century [76]. This pathway entails rapid reductions in CO2 emissions of 15% per annum starting no later than 2020 followed by net CO2 uptake from 2030 to 2080, and net zero emissions thereafter. The proposed uptake of CO2 is approximately constant at 7.3Gt/yr. from 2050 to 2080. Thus, the limit is set as net carbon dioxide emissions ≤ − 7.3Gt/yr (see Additional file 1 for further detail).

All of the PQs should be reassessed over time. This is particularly so for the PQ for CO2 emissions. If 15% reductions do not start by 2020 this PQ will need to be amended at this time. Any delay will mean substantially higher reductions will be required.

A quota for methane and nitrous oxide emissions

Methane and nitrous oxide emissions (hence forth referred to as Me-NO) are the only two long-lived greenhouse gases in the list of critical pressures (Additional file 2) which can have positive limits whilst respecting the PBs. As such, these pressures have been grouped under the PQ for Me-NO. It is common practice to assess impacts of greenhouse gases (GHGs) in terms of the amount of CO2 emissions that would result in the same amount of global warming – equivalent CO2 (CO2e), this is the unit that has been selected here.

The PB most affected by Me-NO emissions is the PB for radiative forcing, i.e., a change in radiative forcing since preindustrial forcing ≤ ±1 W/m2. However, there are too many different factors which influence radiative forcing (e.g., greenhouse gas emissions, albedo (Earth’s reflectivity), and aerosol emissions) to use this PB to derive specific limits for Me-NO.

The IPCC has identified several emissions pathways for the future. Even the most stringent of these, RCP2.6, does not meet the PB for radiative forcing this century. However, the 2100 targets for Me-NO under RCP2.6 have been derived on the basis of optimal food production with minimal emissions and minimal land use. It can be shown that these targets are sufficient to respect the PB for radiative forcing (see Additional file 1).

Nitrous oxide is also an ozone depleting substance so the limits for nitrous oxide emissions must also be considered in the context of the PB for ozone depletion. It can be shown that the RCP2.6 2100 target is unlikely to prevent the PB for ozone depletion from being respected (see Additional file 1).

Thus, the RCP2.6 2100 targets have been used as the basis of the PQ for Me-NO. The limit is gross Me-NO emissions ≤ 5.4GtCO2e/yr.

A quota for forestland

There are several critical pressures which relate to land use and land-use change (see Additional file 1). Forestland is of particular significance however, because it plays an integral role in the carbon, water, and nitrogen cycles. Forests also provide habitat for over 80% of terrestrial species [80]. Forestland function cannot be offset by other land types. As such, there are two PQs pertaining to land use, the PQ for forestland (discussed here) and the PQ for biodiversity which addresses land use more broadly, but with specific consideration for the impacts of land use on biodiversity (see section “A Quota for Water”).

The decarbonisation pathway used to determine the limit for CO2 emissions [76] (see section “A Quota for Carbon Dioxide Emissions”) and the PB limit for land use of global forest land ≥75% of original forest area [12] both suggest that approximately 0.9Gha of reforestation will be needed by the end of this century (see Additional file 1). Applying this linearly over the remainder of the century gives a PQ for forestland of deforestation ≤ -11Mha/yr.

A quota for ozone depleting substances

The hole in the ozone layer is an example of how significant damage from human activity can be, and of how effective global action can be in restoring planetary health. The Montreal Protocol is a universally ratified agreement to phase out the production and use of ozone depleting substances. It has been predicted that if the Protocol is respected, i.e., that Montreal gases are phased out, the Planetary Boundary for ozone depletion will be too [5]. Not all ozone depleting substances are included under the Protocol, the notable exception being nitrous oxide. However, provided the PQ for Me-NO is respected, it is unlikely that nitrous oxide emissions would cause the PB for ozone depletion to be exceeded (see Additional file 1).

Montreal gases have different effects on ozone but can be collectively measured in the unit ozone depleting potential kilograms (ODPkg), which is a measure of the relative impact on the ozone of different gases compared to a benchmark substance. The PQ for ozone is set at Montreal gas emissions ≈ 0 ODP kg (see Additional file 1 for more detail).

A quota for aerosols

Aerosols are small particles suspended in the air. They can be released directly, or form as a result of emissions of precursor gases. There was not previously a Pressure indicator for the collective measurement of aerosols and precursors that could be related to the state of the atmosphere.

Aerosol optical depth (AOD) is an optical measure of the concentration of particles in the air. It is the ratio of incident light either scattered or absorbed by airborne particles in a vertical column of air [81]. An AOD of 1 indicates that no light can pass. An AOD of 0 indicates perfectly clear skies.

Meyer and Ryberg have proposed a new unit, equivalent aerosol optical depth (AODe).Footnote 1 Characterisation factors have previously been proposed to link annual mass of emissions of aerosols and precursors to globally averaged change in AOD. Building on this approach, Meyer and Ryberg used these factors to link emissions from an activity to global average AOD and thus determine the AOD equivalent (AODe). This should not be confused with an estimation of actual change in AOD. Such an estimation would be highly inaccurate because of variations to local conditions and the interactions between different aerosols and precursors. AODe provides a link between emissions, the Pressure indicator, and the resultant optical depth, the State indicator. It is thus an appropriate indicator for the PQ for aerosols.

The World Health Organisation suggests that no level of particulate concentration is safe for human health, suggesting an AODe of zero would be the most appropriate. However, the impacts of aerosols on global warming must also be considered. Aerosols have a net cooling effect in the atmosphere and are believed to have substantially dampened the warming effects experienced so far because of greenhouse gas emissions. Eliminating them entirely could lead to accelerated warming which could be more harmful to humanity than a small amount of particulate concentration remaining in the atmosphere.

The PB for radiative forcing is linked to the PQs for CO2, Me-NO, forestland, Montreal gases, and aerosols. Using the previously discussed PQs, and the PB for radiative forcing, a range of acceptable AODe levels can be determined as 0.05 ≤ AODe ≤0.13. The WHO guidelines for maximum particles in the atmosphere can be translated to an upper limit of AODe ≤0.1, which is in line with the PB for aerosols. Thus, the PQ for aerosols is 0.04 ≤ AODe ≤0.1 (see Additional file 1 for additional details).

A quota for nitrogen

Reactive nitrogen is necessary to grow food. However, the overuse of nitrogen can cause algal blooms and create anaerobic dead zones in rivers, lakes, and oceans. The PB for nitrogen is 62TgN/yr. of intentionally fixated nitrogen. This is a Pressure indicator, yet it cannot easily be compared to human activity. Further, it is not the fixation of nitrogen that causes algal blooms. Rather, it is the loss of nitrogen to the environment. Thus, the indicator for the PQ for nitrogen is net nitrogen lost to the environment. This includes virtual nitrogen that has been lost to the environment during the production of food and products, and the nitrogen released in excreta, less any nitrogen recovered, for example through the denitrification of waste water.

The PB for nitrogen was set on the basis of estimates for critical environmental limits for of nitrogen in surface runoff [82]. This basis is also suitable for the PQ indicator. As such, the PQ for nitrogen is net nitrogen lost to the environment ≤ 62 TgN/yr (see Additional file 1 for additional details).

A quota for phosphorus

Like nitrogen, phosphorus is also necessary to grow food but can cause algal blooms if used excessively. The PB for phosphorus is a flow of no more than 11 TgP/yr. from freshwater systems to the ocean. The limit is set at a point where the risk of a global anoxic ocean event is considered low [4].

This indicator is a Pressure indicator but not one that is easily comparable to human activity. A more accessible indicator has been selected for the PQ for phosphorus – net phosphorous released to the environment. It can be assumed that most phosphorus released to the environment will eventually make its way to the oceans. As such, the PQ for phosphorus is set at the same level as the PB for phosphourus i.e., net phosphorous released to the environment ≤ 11 TgP/yr.

A quota for water

Water availability varies significantly across the globe. In some areas it is plentiful. In others, it is very scarce. It is not feasible to transport water over long distances. For this reason, the concept of a global limit for water is debated. However, only a small fraction of total water consumption is direct consumption of local water. The far larger percentage of water consumed is “virtual water”, i.e., water used in the production of goods. Unlike water in its useable form, virtual water is traded globally. Approximately 40% of Europe’s water footprint is imported. We argue that the global distribution of water through trade justifies a global limit for water.

The PB for water consumption is for gross blue water consumption ≤4000 km3. Blue water refers to fresh surface water and groundwater, i.e., the water found in freshwater lakes, rivers and aquifers. Precipitation on land is classified as green water. The authors of the PBs acknowledge that green water is a scarce resource and should be considered within the PBs. However, because of the difficulty in defining a green water boundary they used blue water as a preliminary proxy indicator [5, 12].

Blue water consumption is not a suitable proxy for use in environmental accounting as this would imply that the use of green water, for example rain fed crops, has no impact. On the contrary, human appropriation of green water can result in loss of soil moisture and a decline in moisture feedback of vapour flows [5]. Further, 74% of the global average water footprint of production between 1996 and 2005 was from green water [83].

Gross water consumption is also a poor proxy indicator for environmental accounting purposes as it ignores the end state of the water. Net water consumption and the inclusion of grey water, i.e., the amount of water required to assimilate pollutants in water, gives a more holistic indicator of human appropriation of the water cycle.

The indicator for the PQ for water is therefore net blue, green, and grey water. There is no clearly defined global limit for this indicator. However, on the basis that more than 30% of major groundwater sources are currently being depleted, it is argued by some that we are already at, if not beyond the limit [84]. The PQ for water is thus ≤8500km3 based on the current global water footprint (which includes blue, green, and grey water consumption) [84] (see Additional file 1 for further detail).

Some water accounting experts believe that a weighted water footprint would better account for regionality [85] (see section “The Planetary Quotas in Context” for a discussion on regionality and the weighted water footprint).

A quota for biodiversity

There are five key drivers of biodiversity loss [5, 52, 86,87,88]:

  1. a)

    climate change – shifting habitat to an extent that it is no longer suitable for the threatened species;

  2. b)

    pollution that affects the health of species;

  3. c)

    overexploitation of species, especially due to fishing and hunting but also overuse of ecosystem services leading to aforementioned habitat loss;

  4. d)

    spread of invasive species or genes outcompeting endogenous species; and

  5. e)

    habitat loss, fragmentation or change, especially due to agriculture, large-scale forestry, and human infrastructure.

Climate change is considered under the PQs for CO2, Me-NO, forestland, Montreal gases, and aerosols. Pollution is considered under the PQs for aerosols, water, nitrogen, phosphorus, and novel entities. The remaining three drivers have complex and diverse pathways. A study by the Convention on Biodiversity CBD [89] summarised the primary drivers for over 500 invasive species and found over 40 drivers ranging from purposeful release for measures such as erosion control, and hunting, to escape of pets, contamination of international trade objects, and stowaways on container ships. At this time, no Pressure indicator exists to account for all three of these drivers.

Land-use change is considered by many to be the greatest threat to biodiversity [88, 90,91,92,93,94,95]. For this reason, the use of land-based indicators as a proxy for biodiversity is common practise. The Ecological Footprint is often used as a proxy indicator for biodiversity health on the basis that it is a measure of how much biologically productive land is used by humans. Some level of overexploitation of marine and terrestrial species is taken into account in this metric [86]. The problem with using this indicator is that there is little consensus as to an appropriate limit [46, 86, 91, 96,97,98].

In a UNEP report on life cycle indicators, the need for a scalable indicator to assess the land use related impacts on biodiversity was identified and a new indicator proposed [99]. The indicator is called the percentage disappeared fraction (PDF) of species. This indicator is similar to the Ecological Footprint in that different types of land are weighted in terms of relative impacts. However, it has been specifically developed as a proxy indicator for biodiversity loss. Moreover, the unit can easily be equated to the Planetary Boundary for biosphere integrity – extinction rate – as both are expressed in terms of the percentage of extinct (or disappeared) species. The difference between the PDF and extinction rate is in their determination. Extinction rate is determined through observation – it is an Impact indicator. In contrast, PDF is estimated using land use data – thus a Pressure indicator. The PQ for biodiversity it thus PDF ≤1E-4/yr.

The purpose of the UNEP report was to propose indicators that allow better consistency in the development and communication of green products. This differs from the purpose of the Quotas in that the Quotas are intended to be the basis of a global Planetary Accounting Framework that can be used for any scale of human activity. In the instance of the UNEP report, there is little need to account for positive land transformation. As such, all of the “correction factors” – numbers used to convert land transformation to percentage disappeared fraction – are positive (i.e. they lead to biodiversity loss). Further work will be required to determine correction factors for positive transformation which results in biodiversity gains.

A quota for novel entities

There is no indicator or limit proposed for novel entities in the PB framework. However, they are included as a PB to give an indication of their importance to planetary health. The authors of the PB framework define novel entities as new substances, new forms of existing substances and modified life-forms that have the potential for unwanted geophysical and/or biological effects.

The environmental impacts from novel entities most often occur because of the disposal of these. The release of toxins into waterways. The disposal of waste to landfill. The disposal of plastic into oceans. As such, we propose the indicator net imperishable waste measured in kilograms to account for the wide variety of novel entities.

There is no specific limit proposed in the literature for this metric. However, there is evidence that we are beyond the limit. For example, 83% of tap water samples from 12 nations have been found to be contaminated with plastic [100]; methane from landfills and wastes contributes approximately 23% of global methane emissions [101]; most fish which are high in the food chain now contain high levels of heavy metals such as mercury [102]. The PQ for novel entities is therefore net imperishable waste ≈ 0 kg/yr.

The choice of net rather than gross waste is to allow environmental impact assessment results to show negative imperishable waste disposal. In this way, activities such as landfill mining which result in a net removal could be encouraged. Value could be assigned to such activities to allow for trading of impacts within a global cap. Further work should be undertaken to determine whether a zero limit is sufficient.

The Planetary Accounting Framework

The Planetary Quotas form the foundations for the new Planetary Accounting Framework (PAF). The PAF shows how the PQs can be used in a poly-scalar approach to manage global impacts. It can be used to assess the impacts of different scales of human activity against planetary limits. Figure 7 shows how the Framework can work for different scales and purposes.

Fig. 7
figure 7

The Planetary Accounting Framework (figures are for visualisation purpose only)

The left-hand side shows the inputs and the right-hand side shows the outputs. The inputs are both top-down – scaling the Planetary Quotas to the scale of assessment – and bottom up – using environmental impact assessment methods to estimate impacts in each environmental activity.

Bottom up

Prior to completing an environmental impact assessment, the scope, i.e., the inclusions and exclusions, must be determined. The scope of assessment will depend on the purpose. For example, if a city government was looking to compare impacts per capita of their population with another city’s population it would likely be most appropriate to assess the final consumption of its inhabitants. In contrast, if the same city was trying to prioritise infrastructure and development it might be more appropriate to assess the impacts that occur within the city itself.

The inclusions and exclusions can make a very big difference to the results. For example, in Sweden the emissions produced within the Swedish borders has reduced from 72.7 MtCO2e in 1990 to 66.2 MtCO2 in 2010 (Swedish EPA, 2012a). However, when they calculated the emissions corresponding to the consumption of the inhabitants of Sweden, the results were 76 MtCO2 in 1990 and 95 MtCO2 in 2010 (Swedish EPA, 2010). One set of accounts showed a decrease in emissions while the other showed an increase. Both sets of accounts provide information that is useful, but for different purposes.

Once the scope is defined, an environmental impact assessment can then be done to determine the impacts in each of the PQ currencies using standard environmental assessment methods.

Top down

To translate the global PQs to the scale of the planetary accounts (e.g., national, city, business), an allocation procedure will need to be determined. The Planetary Quotas help to resolve the mathematics of apportioning shares of the operating space to different scales of human activity. However, distributing Earth’s finite resources among past, present, and future generation is not simply a question of mathematics. It is question of ethics, morals, and beliefs.

For the PAF to form the general system of rules for a poly-scalar approach to managing global impacts it should have different mechanisms at different scales and for different purposes. For such a flexible approach, allocation procedures also need to have a high degree of flexibility. An allocation procedure for PQs for the basis of self-organised initiatives is likely to be self-selected. Global negotiations for national commitments to PQs are likely to be heavily influenced by politics. Private organisations may agree sectoral approaches to allocating Quotas, may self-select allocation procedures for Quotas as part of an internal sustainability strategy, or may be allocated Quotas by local authorities or company managers. The PAF does not attempt to resolve the question of which allocation procedure(s) is most suitable. Rather, it has the flexibility to allow different types of allocation procedure to be applied as needed.

The Quotas as shown in Table 3 are global limits. Each Quota has been designed to be scalable, however, not every Quota is divisible. The Carbon Quota is an example of a Quota that is divisible – i.e., the global Quota of − 7.3 GtCO2/yr. could be divided by the global population (say 7.5 billion) to get an equal per capita share of ≈ − 1 tCO2/yr. per person.

In contrast, the PQ for aerosols is not divisible. The unit (aerosol optical depth equivalent) applies directly at any scale. Thus, both the global Planetary Quota, is the same as (for example) any individual’s Planetary Quota. Table 4 shows which Quotas are divisible and which are not.

Table 4 Divisible and non-divisible Quotas

The impact balance sheet

The results of the environmental impact assessment can then be compared to the scaled PQs in the planetary accounts. An “impact balance statement” can be used show the impact and limit for each PQ currency, and thus the credit or deficit.

The idea of “credits” in each currency could be seen as encouragement to “optimise on the edge” – to push our impacts to the limits. However, we include this terminology intentionally. Currently, language around environmental impacts is often very negative. There is a focus on reducing bad as opposed to improving good. The concept of environmental credits could help to shift the conversation to a focus on improving environmental maintenance. It could also provide a mechanism to financially incentivise those who are remaining below their targets or creating a net positive outcome.

Potential applications

The right-hand side of Fig. 7 shows some of the ways planetary accounts could be used. The PAF could allow meaningful decisions to be made at different levels or sectors regarding policy, planning, technology, business operations, legislation, and behaviour. It could enable the incorporation of the economic value of environmental impacts and management into existing global economic structures. The Framework enables the practical application and communication of the Planetary Boundaries to different scales of human activity.


The planetary quotas in context

In the latest update of the Planetary Boundaries the authors [12] show that four of the nine Boundaries have been exceeded, and that two have not been measured. Global estimates (shown in Table 5) indicate that five of the Quotas are currently exceeded, one is on the threshold, and the remaining two are uncertain. The current global estimates are shown against each Quota in Table 4.

Table 5 Each of the Planetary Quotas is shown against the estimate current global status

Planetary quotas versus planetary boundaries

The Planetary Quotas complement rather than replace the Planetary Boundaries. The relationship between the two sets of indicators can be compared to human health. If a person visits a doctor, the doctor might measure State indicators such as blood pressure, heart rate, weight, and liver function to assess his health. If he is not healthy, his doctor is likely to prescribe a course of action. This might include a maximum calorific intake, a minimum level of exercise, and the avoidance of some activities, such as smoking. The PBs provide an indication of planetary health. The PQs are the prescription for a healthy planet.

This means that meeting or exceeding PQs gives a different message to meeting or exceeding PBs. For example, we have exceeded the PBs for climate change. It would take decades of living within the PQs associated with climate change to return to within the PB for climate change. For PBs that have not yet been exceeded, the PQs give an indication of whether we are heading towards the limits, or are likely to remain within them.

Unlike the Boundaries, no “zone of uncertainty” has been included for the Quotas. The zone of uncertainty is included in the Boundary framework to account for the fact that the science is uncertain. The Quotas are intended for use in policy, the design of technology, regulations, and behaviour within communities, households and businesses. In keeping with the precautionary principle, we have thus set the Quotas according to the lower limits in the Planetary Boundary framework. Future work should include estimations of uncertainty around the Quota values.

Global vs regional limits and impacts - an issue of scale

Greenhouse gases have a long atmospheric lifetime and become well mixed in the atmosphere. This means it is of little importance where the gas is emitted. 1 kg of CO2 will have the same contribution to global warming wherever it is released.

This is not the case for all of the impacts that are considered within the PQs, for example water consumption or the release of nitrogen into the environment. It is not the case that 1 kg consumed or released in one location will have the same impacts as 1 kg consumed or released elsewhere. If we take a few thousand litres of water from a water source with abundant supply, the local impacts are likely negligible. Taking just a few litres from another, water poor source, may have disastrous local effects. The release of a kilogram of nitrogen in a sparse agricultural area will have less impact on the Earth system than in an intense agricultural zone with risks of ground water contamination.

In the example of water, some authors advocate for a weighted water footprint to incorporate the different impacts of consuming water from different locations. The premise is that water from water rich water bodies should be given less environmental weighting than water from water scarce water bodies. A unit of equivalent water has been proposed based on a water stress index that is based on the availability and withdrawals of a given water body. [103]

The problem with this proposal is that the impacts assigned to a given withdrawal of water depend on withdrawals by others from the same water body. Whilst this may give a realistic measure of impacts, it does not offer a useful indicator for decision making and planning. A company which has put substantial effort into reducing water consumption could have their weighted water footprint doubled because an independent company starts to use the same water body. In the same way, if a large company set up and put local companies out of business thus eliminating their use of a water body, their weighted water footprint would go down, even if they had taken no steps at all to improve their water use efficiency. This is not consistent with other impacts that are assessed in terms of equivalency. For example, greenhouse gases are often measured in terms of equivalent CO2 emissions. The proposed new metric for aerosols discussed in the previous section uses the unit equivalent AOD. These equivalencies are not dependent on other actors. If a company emits 50 kg of nitrous oxide, this is equivalent to 14.9 t of CO2 no matter what other companies are doing.

There is no question that the scarcity of a source of water should be considered when environmental impacts of an activity are assessed. However, we disagree with the water weighting approach as it is inconsistent with environmental accounting practises. There are other ways that regionality could be included in planetary accounts. For example, a binary water scarcity indicator (yes/no) could be reported alongside the net water footprint to convey the suitability of the water source. Regional issues for other environmental currencies could be included in a similar way. Further work should be undertaken to explore this.

Planetary Accounting is not intended as the one super-system to resolve all environmental problems. The purpose of Planetary Accounting is to allow humanity to manage human activity such that it does not push the Earth system into a new geological state. There are many local environmental problems that do not translate simply into planetary limits. For example, land instability and polluted waterways due to poor farming practices, light pollution, and the urban heat island effect. Planetary Accounting does not replace local environmental management practices created locally and solvable locally; these must be dealt with at a local level. The Planetary Boundaries and the PQ’s derived from them are a context of limits that can be translated into action to solve these global constraints at various levels of activity.


The PQs show what is needed to return to and remain within the safe operating space of the PBs. They define an end goal rather than a pathway of reductions. There is no timeframe associated with any of the PQs except the PQ for CO2 emissions. This is because the CO2 budget is based on cumulative emissions so the longer we delay in achieving this PQ, the more stringent it would need to be. However, at any time that any of the Quotas or Boundaries are not respected, humanity is at risk of departure from a Holocene-like state. We should work to live within the PQs as soon as possible and if like the climate change boundary we have exceeded them then we must rapidly get to work to reclaiming a safe-operating space.

Comparing planetary quotas

We have not proposed a mechanism to compare one Quota to another or to amalgamate the results of environmental assessments into a single indicator of sustainability. This is intentional. The Earth cannot amalgamate these environmental currencies or trade one for another. If we consume too much water, this cannot be resolved by emitting less carbon, though it is appreciated that there is a nexus between water and carbon. At a global scale, each of the Quotas must be respected if we are to operate within the Planetary Boundaries.

The planetary quotas are a moving target not a static value

The Earth system is dynamic and the rate of increase in scientific understanding of its processes and limits is high. There is not time to wait until we have a perfect understanding of the system or its limits before we take action to operate within these – this may never eventuate. The indicators and limits presented in this paper are intended to be preliminary. It is our intention that, like the Planetary Boundaries, these are subjected to scrutiny, discussion, and analysis, and are regularly reviewed and updated over time as we advance in our collective knowledge and understanding.

Opportunities for planetary accounting in practice

The PAF has been designed with a high degree of flexibility with the intention that this could enable a wide range of applications that go beyond those envisioned by the authors. Some of the applications it could be used for are discussed here.

Economic value

We have not included a mechanism to enable the trading of one PQ currency for another, however this does not preclude the opportunity to trade in each of the Quota currencies at lower scales. On the contrary, Planetary Accounting provides an opportunity for a global trading system for key global environmental “currencies” and in the process firms can see how these parameters interact and are synergistic. Moreover, the real costs to humanity of exceeding planetary limits – i.e. the costs of adaptation and mitigation – or the value of undershoot – i.e. the money not spent because nature provides a service - could be used to assign a monetary value to each environmental currency, for example $X / kg of nitrogen. The true cost to society might only be known in hindsight. However, if values were assigned to each unit of environmental currency, companies could make money from the restoration and maintenance of Earth-system processes. Such an exercise could facilitate the incorporation of the environmental impacts into existing global economic frameworks thus enabling a further decoupling of wealth creation and environmental footprint [42].

Behaviour change

Behaviour change programmes such as a smart phone application could be based on the Planetary Quotas. In a live game, individuals could compete with friends and strangers across the globe to live within their share of the planet’s limits. The same could be used by firms wanting to create a market for new design and technology products and services.

To facilitate better producer and consumer responsibility, a product labelling system similar to the nutritional facts labelling system for food could be developed based on the Quotas (see Fig. 8). Whether this was displayed on products as part of a labelling system, or simply made available online, companies could use such a system to communicate the impacts of goods and services in different environmental currencies. A global labelling scheme could provide an opportunity to address the regional variation of some Quotas (such as the water Quota), discussed later.

Fig. 8
figure 8

Planetary Facts Labelling

Further work would be required to determine the appropriate format, inclusions, and exclusions for a labelling system such that it could be both accessible to a wide audience, and implementable for producers.


One of the major limitations of the PAF is a lack of available data. It would not currently be possible for a person to determine the impacts of their consumption to compare against her PQ as it would be difficult to estimate the impacts of most of the products and services that she uses. A company seeking to understand the impacts of their products may not be able to obtain data on the impacts of the extraction of raw materials. The time and cost associated with obtaining the data needed for a detailed environmental impact assessment can often be prohibitive. The availability of data and simplification of environmental impact assessments will be an important area of future work to make planetary accounting feasible.

In many applications double counting of impacts is to be expected – for example the impacts of a person’s consumption of a litre of milk would be counted in her accounts, the milk producer’s accounts, the city’s consumption-based accounts and the production accounts for the region where the milk was made. This sort of double counting is not a problem. However, if financial transactions are based on overshoot and undershoot, further work will be required to develop a system to manage double counting.

Another limitation of the PAF is that it has not yet been applied and evaluated as an instrument to guide policy, business, or behavioural decisions. In the development of the concept, and particularly of the framework, much effort was taken to envision the different applications to determine and address potential weaknesses of the system. However, there is no substitute for real world applications.


Humankind has the scientific knowledge needed to manage the Anthropocene and ensure a Holocene-like state of the environment is retained; but we will need to change as the limits expressed by the Planetary Boundaries are being approached or exceeded. There is evidence that a poly-scalar approach is the most effective change mechanism to manage the global commons through engaging different levels of human activity. Environmental accounting has advanced to the point that we can estimate what the environmental impacts of an activity are or will be. These three theories are advanced in the literature but are disconnected from one another. The Planetary Accounting Framework based on the new Planetary Quotas brings these three theories together.

Planetary Accounting is a novel framework that could facilitate an unprecedented, global, multi-scaled approach to managing the Earth system. There will undoubtedly be many ways to improve the system suggested here but this paper has started a process that can allow scientists and policy makers to work in a more concerted way to help create a future where the planet remains in the safe operating space.


  1. Manuscript in preparation.



Aerosol Optical Depth equivalent

CO2 :

Carbon dioxide


Carbon dioxide equivalent




Dobson Unit


Extinctions per million species per year


Greenhouse Gas


Life Cycle Assessment


Methane and Nitrous Oxide


Planetary Accounting Framework


Planetary Boundary


Parts per million


Planetary Quota


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We acknowledge Alan Merry for his extensive feedback on early drafts of this manuscript.


Australian Postgraduate Award & Curtin University Postgraduate Scholarship received by Kate Meyer as a PhD stipend for the duration of the research.

Australia Domain Administration (AuDA) provided a top up scholarship for Kate Meyer for the duration of the research.

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KM conceived of the study, developed the methodology, carried out the research and drafted the manuscript. PN provided senior guidance throughout the research and contributed to the final manuscript. Both authors read and approved the final manuscript.

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Meyer, K., Newman, P. The Planetary Accounting Framework: a novel, quota-based approach to understanding the impacts of any scale of human activity in the context of the Planetary Boundaries. Sustain Earth 1, 4 (2018).

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