Sustainability measurement

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Sustainability measurement is the quantitative basis for the informed management of sustainability. [1] The metrics used for the measurement of sustainability (involving the sustainability of environmental, social and economic domains, both individually and in various combinations) are still evolving: they include indicators, benchmarks, audits, indexes and accounting, as well as assessment, appraisal [2] and other reporting systems. They are applied over a wide range of spatial and temporal scales. [3] [4]


Some of the best known and most widely used sustainability measures include corporate sustainability reporting, Triple Bottom Line accounting, and estimates of the quality of sustainability governance for individual countries using the Global Green Economy Index (GGEI), Environmental Sustainability Index and Environmental Performance Index. An alternative approach, used by the United Nations Global Compact Cities Programme and explicitly critical of the triple-bottom-line approach is Circles of Sustainability. [5] [6]

Sustainability need and framework.

Sustainability development has become yardstick of improvement for industries and are being integrated into effective business strategies. The needs for sustainability measurement are, improvement in the operations, bench-marking performances, tracking progress, evaluating process, etc. [7] For the purpose of building a proper sustainability indicator, framework is developed and the steps are as follows: [8]

  1. Defining the system- A proper and definite system is defined. A proper system boundary is drawn for further analysis.
  2. Elements of the system- The whole input, output of materials, emissions, energy and other auxiliary elements are properly analysed. The working conditions, process parameters and characteristics are defined in this step.
  3. Indicators selection- The indicators is selected of which measurement has to be done. This forms the metric for this system whose analysis is done in the further steps.
  4. Assessment and Measurement- Proper assessing tools are used and tests or experiments are performed for the pre-defined indicators to give a value for the indicators measurement.
  5. Analysis and reviewing the results- Once the results have been obtained, proper analysis and interpretation is done and tools are used to improve and revise the processes present in the system.

Sustainability indicators and their function

The principal objective of sustainability indicators is to inform public policy-making as part of the process of sustainability governance. [9] Sustainability indicators can provide information on any aspect of the interplay between the environment and socio-economic activities. [10] Building strategic indicator sets generally deals with just a few simple questions: what is happening? (descriptive indicators), does it matter and are we reaching targets? (performance indicators), are we improving? (efficiency indicators), are measures working? (policy effectiveness indicators), and are we generally better off? (total welfare indicators).

The International Institute for Sustainable Development and the United Nations Conference on Trade and Development established the Committee on Sustainability Assessment (COSA) in 2006 to evaluate sustainability initiatives operating in agriculture and develop indicators for their measurable social, economic and environmental objectives. [11]

One popular general framework used by The European Environment Agency uses a slight modification of the Organisation for Economic Co-operation and Development DPSIR system. [12] This breaks up environmental impact into five stages. Social and economic developments (consumption and production) (D)rive or initiate environmental (P)ressures which, in turn, produces a change in the (S)tate of the environment which leads to (I)mpacts of various kinds. Societal (R)esponses (policy guided by sustainability indicators) can be introduced at any stage of this sequence of events.

Metrics at the global scale

There are numerous indicators which could be used as basis for sustainability measurement. Few commonly used indicators are:

Environmental sustainability indicators: [13]

Economic indicators: [14] [15]

Social indicators: [15]

Due to the large numbers of various indicators that could be used for sustainability measurement, proper assessment and monitoring is required. [15] In order to organize the chaos and disorder in selecting the metrics, specific organizations have been set up which groups the metrics under different categories and defines proper methodology to implement it for measurement. They provide modelling techniques and indexes to compare the measurement and have methods to convert the scientific measurement results into easy to understand terms. [16]

United Nations indicators

The United Nations has developed extensive sustainability measurement tools in relation to sustainable development [17] as well as a System of Integrated Environmental and Economic Accounting. [18]

United Nations Commission on Sustainable Development United Nations Commission on Sustainable Development.jpg
United Nations Commission on Sustainable Development

The UN Commission on Sustainable Development (CSD) has published a list of 140 indicators which covers environmental, social, economical and institutional aspects of sustainable development. [19]

Benchmarks, indicators, indexes, auditing etc.

In the last couple of decades, there has arisen a crowded toolbox of quantitative methods used to assess sustainability — including measures of resource use like life cycle assessment, measures of consumption like the ecological footprint and measurements of quality of environmental governance like the Environmental Performance Index. The following is a list of quantitative "tools" used by sustainability scientists - the different categories are for convenience only as defining criteria will inter grade. It would be too difficult to list all those methods available at different levels of the organisation so those listed here are at for the global level only.

A benchmark is a point of reference for a measurement. Once a benchmark is established it is possible to assess trends and measure progress. Baseline global data on a range of sustainability parameters is available in the list of global sustainability statistics.
A sustainability index is an aggregate sustainability indicator that combines multiple sources of data. There is a Consultative Group on Sustainable Development Indices [20]
Many environmental problems ultimately relate to the human effect on those global biogeochemical cycles that are critical to life. Over the last decade monitoring these cycles have become a more urgent target for research:
Sustainability auditing and reporting are used to evaluate the sustainability performance of a company, organization, or other entity using various performance indicators. [24] Popular auditing procedures available at the global level include:
Some accounting methods attempt to include environmental costs rather than treating them as externalities

Resource metrics

Part of this process can relate to resource use such as energy accounting or to economic metrics or price system values as compared to non-market economics potential, for understanding resource use. [30]

An important task for resource theory (energy economics) is to develop methods to optimize resource conversion processes. [31] These systems are described and analyzed by means of the methods of mathematics and the natural sciences. [32] Human factors, however, have dominated the development of our perspective of the relationship between nature and society since at least the Industrial Revolution, and in particular, have influenced how we describe and measure the economic impacts of changes in resource quality. A balanced view of these issues requires an understanding of the physical framework in which all human ideas, institutions, and aspirations must operate. [33]

Oil imports by country Oil imports.PNG
Oil imports by country

Energy returned on energy invested

When oil production first began in the mid-nineteenth century, the largest oil fields recovered fifty barrels of oil for every barrel used in the extraction, transportation, and refining. This ratio is often referred to as the Energy Return on Energy Investment (EROI or EROEI). Currently, between one and five barrels of oil are recovered for each barrel-equivalent of energy used in the recovery process. [34] As the EROEI drops to one, or equivalently the Net energy gain falls to zero, the oil production is no longer a net energy source. [35] This happens long before the resource is physically exhausted.

Note that it is important to understand the distinction between a barrel of oil, which is a measure of oil, and a barrel of oil equivalent (BOE), which is a measure of energy. Many sources of energy, such as fission, solar, wind, and coal, are not subject to the same near-term supply restrictions that oil is. Accordingly, even an oil source with an EROEI of 0.5 can be usefully exploited if the energy required to produce that oil comes from a cheap and plentiful energy source. Availability of cheap, but hard to transport, natural gas in some oil fields has led to using natural gas to fuel enhanced oil recovery. Similarly, natural gas in huge amounts is used to power most Athabasca Tar Sands plants. Cheap natural gas has also led to Ethanol fuel produced with a net EROEI of less than 1, although figures in this area are controversial because methods to measure EROEI are in debate.[ citation needed ]

Growth-based economic models

Insofar as economic growth is driven by oil consumption growth, post-peak societies must adapt. M. King Hubbert believed: [36]

Our principal constraints are cultural. During the last two centuries we have known nothing but exponential growth and in parallel we have evolved what amounts to an exponential-growth culture, a culture so heavily dependent upon the continuance of exponential growth for its stability that it is incapable of reckoning with problems of nongrowth.

Some economists describe the problem as uneconomic growth or a false economy. At the political right, Fred Ikle has warned about "conservatives addicted to the Utopia of Perpetual Growth". [37] Brief oil interruptions in 1973 and 1979 markedly slowed - but did not stop - the growth of world GDP. [38]

Between 1950 and 1984, as the Green Revolution transformed agriculture around the globe, world grain production increased by 250%. The energy for the Green Revolution was provided by fossil fuels in the form of fertilizers (natural gas), pesticides (oil), and hydrocarbon fueled irrigation. [39]

David Pimentel, professor of ecology and agriculture at Cornell University, and Mario Giampietro, senior researcher at the National Research Institute on Food and Nutrition (INRAN), place in their study Food, Land, Population and the U.S. Economy the maximum U.S. population for a sustainable economy at 200 million. To achieve a sustainable economy world population will have to be reduced by two-thirds, says the study. [40] Without population reduction, this study predicts an agricultural crisis beginning in 2020, becoming critical c. 2050. The peaking of global oil along with the decline in regional natural gas production may precipitate this agricultural crisis sooner than generally expected. Dale Allen Pfeiffer claims that coming decades could see spiraling food prices without relief and massive starvation on a global level such as never experienced before. [41] [42]

Hubbert peaks

Hubbert Peak vs Oil Production Hubbert peak oil plot.svg
Hubbert Peak vs Oil Production

There is an active debate about most suitable sustainability indicator's use and by adopting a thermodynamic approach through the concept of "exergy" and Hubbert peaks, it is possible to incorporate all into a single measure of resource depletion.The exergy analysis of minerals could constitute a universal and transparent tool for the management of the earth's physical stock. [43] [15]

Hubbert peak can be used as a metric for sustainability and depletion of non-renewable resources. It can be used as reference for many metrics for non-renewable resources such as: [44]

  1. Stagnating supplies
  2. Rising prices
  3. Individual country peaks
  4. Decreasing discoveries
  5. Finding and development costs
  6. Spare capacity
  7. Export capabilities of producing countries
  8. System inertia and timing
  9. Reserves-to-production ratio
  10. Past history of depletion and optimism

Although Hubbert peak theory receives most attention in relation to peak oil production, it has also been applied to other natural resources.

Natural gas

Doug Reynolds predicted in 2005 that the North American peak would occur in 2007. [45] Bentley (p. 189) predicted a world "decline in conventional gas production from about 2020". [46]


Peak coal is significantly further out than peak oil, but we can observe the example of anthracite in the US, a high grade coal whose production peaked in the 1920s. Anthracite was studied by Hubbert, and matches a curve closely. [47] Pennsylvania's coal production also matches Hubbert's curve closely, but this does not mean that coal in Pennsylvania is exhausted—far from it. If production in Pennsylvania returned at its all-time high, there are reserves for 190 years. Hubbert had recoverable coal reserves worldwide at 2500 × 109 metric tons and peaking around 2150(depending on usage).

More recent estimates suggest an earlier peak. Coal: Resources and Future Production (PDF 630KB [48] ), published on April 5, 2007 by the Energy Watch Group (EWG), which reports to the German Parliament, found that global coal production could peak in as few as 15 years. [49] Reporting on this Richard Heinberg also notes that the date of peak annual energetic extraction from coal will likely come earlier than the date of peak in quantity of coal (tons per year) extracted as the most energy-dense types of coal have been mined most extensively. [50] A second study, The Future of Coal by B. Kavalov and S. D. Peteves of the Institute for Energy (IFE), prepared for European Commission Joint Research Centre, reaches similar conclusions and states that ""coal might not be so abundant, widely available and reliable as an energy source in the future". [49]

Work by David Rutledge of Caltech predicts that the total of world coal production will amount to only about 450 gigatonnes. [51] This implies that coal is running out faster than usually assumed.

Finally, insofar as global peak oil and peak in natural gas are expected anywhere from imminently to within decades at most, any increase in coal production (mining) per annum to compensate for declines in oil or NG production, would necessarily translate to an earlier date of peak as compared with peak coal under a scenario in which annual production remains constant.

Fissionable materials

In a paper in 1956, [52] after a review of US fissionable reserves, Hubbert notes of nuclear power:

There is promise, however, provided mankind can solve its international problems and not destroy itself with nuclear weapons, and provided world population (which is now expanding at such a rate as to double in less than a century) can somehow be brought under control, that we may at last have found an energy supply adequate for our needs for at least the next few centuries of the "foreseeable future."

Technologies such as the thorium fuel cycle, reprocessing and fast breeders can, in theory, considerably extend the life of uranium reserves. Roscoe Bartlett claims [53]

Our current throwaway nuclear cycle uses up the world reserve of low-cost uranium in about 20 years.

Caltech physics professor David Goodstein has stated [54] that

... you would have to build 10,000 of the largest power plants that are feasible by engineering standards in order to replace the 10 terawatts of fossil fuel we're burning today ... that's a staggering amount and if you did that, the known reserves of uranium would last for 10 to 20 years at that burn rate. So, it's at best a bridging technology ... You can use the rest of the uranium to breed plutonium 239 then we'd have at least 100 times as much fuel to use. But that means you're making plutonium, which is an extremely dangerous thing to do in the dangerous world that we live in.


Hubbert applied his theory to "rock containing an abnormally high concentration of a given metal" [55] and reasoned that the peak production for metals such as copper, tin, lead, zinc and others would occur in the time frame of decades and iron in the time frame of two centuries like coal. The price of copper rose 500% between 2003 and 2007 [56] was by some attributed to peak copper. [57] [58] Copper prices later fell, along with many other commodities and stock prices, as demand shrank from fear of a global recession. [59] Lithium availability is a concern for a fleet of Li-ion battery using cars but a paper published in 1996 estimated that world reserves are adequate for at least 50 years. [60] A similar prediction [61] for platinum use in fuel cells notes that the metal could be easily recycled.


Phosphorus supplies are essential to farming and depletion of reserves is estimated at somewhere from 60 to 130 years. [62] Individual countries supplies vary widely; without a recycling initiative America's supply [63] is estimated around 30 years. [64] Phosphorus supplies affect total agricultural output which in turn limits alternative fuels such as biodiesel and ethanol.

Peak water

Hubbert's original analysis did not apply to renewable resources. However over-exploitation often results in a Hubbert peak nonetheless. A modified Hubbert curve applies to any resource that can be harvested faster than it can be replaced. [65]

For example, a reserve such as the Ogallala Aquifer can be mined at a rate that far exceeds replenishment. This turns much of the world's underground water [66] and lakes [67] into finite resources with peak usage debates similar to oil. These debates usually center around agriculture and suburban water usage but generation of electricity [68] from nuclear energy or coal and tar sands mining mentioned above is also water resource intensive. The term fossil water is sometimes used to describe aquifers whose water is not being recharged.

Renewable resources

Sustainability gaps

Sustainability measurements and indicators is an ever-evolving and changing process and has various gaps to be filled in order to achieve a proper framework and model. Following points are some of the breaks in continuity:

See also

Related Research Articles

The Hubbert curve is an approximation of the production rate of a resource over time. It is a symmetric logistic distribution curve, often confused with the "normal" gaussian function. It first appeared in "Nuclear Energy and the Fossil Fuels," geologist M. King Hubbert's 1956 presentation to the American Petroleum Institute, as an idealized symmetric curve, during his tenure at the Shell Oil Company. It has gained a high degree of popularity in the scientific community for predicting the depletion of various natural resources. The curve is the main component of Hubbert peak theory, which has led to the rise of peak oil concerns. Basing his calculations on the peak of oil well discovery in 1948, Hubbert used his model in 1956 to create a curve which predicted that oil production in the contiguous United States would peak around 1970.

Resource depletion depletion of natural organic and inorganic resources

Resource depletion is the consumption of a resource faster than it can be replenished. Natural resources are commonly divided between renewable resources and non-renewable resources. Use of either of these forms of resources beyond their rate of replacement is considered to be resource depletion. The value of a resource is a direct result of its availability in nature and the cost of extracting the resource, the more a resource is depleted the more the value of the resource increases. There are several types of resource depletion, the most known being: Aquifer depletion, deforestation, mining for fossil fuels and minerals, pollution or contamination of resources, slash-and-burn agricultural practices, Soil erosion, and overconsumption, excessive or unnecessary use of resources.

Industrial ecology (IE) is the study of material and energy flows through industrial systems. The global industrial economy can be modelled as a network of industrial processes that extract resources from the Earth and transform those resources into commodities which can be bought and sold to meet the needs of humanity. Industrial ecology seeks to quantify the material flows and document the industrial processes that make modern society function. Industrial ecologists are often concerned with the impacts that industrial activities have on the environment, with use of the planet's supply of natural resources, and with problems of waste disposal. Industrial ecology is a young but growing multidisciplinary field of research which combines aspects of engineering, economics, sociology, toxicology and the natural sciences.

Hubbert peak theory

The Hubbert peak theory says that for any given geographical area, from an individual oil-producing region to the planet as a whole, the rate of petroleum production tends to follow a bell-shaped curve. It is one of the primary theories on peak oil.

Peak oil Time when the maximum rate of petroleum extraction is reached

Peak oil is the theorized point in time when the maximum rate of extraction of petroleum is reached, after which it is expected to enter terminal decline. As of 2020, peak oil forecasts range from 2019 to the 2040s, depending on economics and how governments respond to global warming. It is often confused with oil depletion; however, whereas depletion refers to a period of falling reserves and supply, peak oil refers to the point of maximum production. The concept of peak oil is often credited to geologist M. King Hubbert whose 1956 paper first presented a formal theory. Peak oil occurs when the cost of oil extraction exceeds the price consumers will pay.

Jevons paradox Economical paradox

In economics, the Jevons paradox occurs when technological progress or government policy increases the efficiency with which a resource is used, but the rate of consumption of that resource rises due to increasing demand. The Jevons paradox is perhaps the most widely known paradox in environmental economics. However, governments and environmentalists generally assume that efficiency gains will lower resource consumption, ignoring the possibility of the paradox arising.

In energy economics and ecological energetics, energy return on investment (EROI), also sometimes called energy returned on energy invested (ERoEI), is the ratio of the amount of usable energy delivered from a particular energy resource to the amount of energy used to obtain that energy resource.

Backstop resources theory states that as a heavily used limited resource becomes expensive, alternative resources will become cheap by comparison, therefore making the alternatives economically viable options. In the long term, the theory implies faith that technological progress will allow backstop resources to be essentially unlimited, and that need will cause the development of new technologies to become cost effective. This idea is supported by economist Robert Solow who claimed that four-fifths of US economic growth could be attributed to technological development.

World energy resources

World energy resources are the estimated maximum capacity for energy production given all available resources on Earth. They can be divided by type into fossil fuel, nuclear fuel and renewable resources.

Hubbert linearization transformation of the logistic growth curve in a linear mathematical relationship

The Hubbert linearization is a way to plot production data to estimate two important parameters of a Hubbert curve, the approximated production rate of a nonrenewable resource following a logistic distribution:

Mitigation of peak oil

The mitigation of peak oil is the attempt to delay the date and minimize the social and economic effects of peak oil by reducing the consumption of and reliance on petroleum. By reducing petroleum consumption, mitigation efforts seek to favorably change the shape of the Hubbert curve, which is the graph of real oil production over time predicted by Hubbert peak theory. The peak of this curve is known as peak oil, and by changing the shape of the curve, the timing of the peak in oil production is affected. An analysis by the author of the Hirsch report showed that while the shape of the oil production curve can be affected by mitigation efforts, mitigation efforts are also affected by the shape of Hubbert curve.

According to M. King Hubbert's Hubbert peak theory, peak gas is the point in time at which the maximum global natural gas production rate will be reached, after which the rate of production will enter its terminal decline. Natural gas is a fossil fuel formed from plant matter over the course of millions of years. It is a finite resource and thus considered to be a non-renewable energy source.

Peak coal is a concept describing the peak consumption or production of coal by a human community. Global coal peak consumption was in 2013. The peak of coal's share in the global energy mix was in 2008, when coal accounted for 30% of global energy production. The decline in coal use is largely driven by consumption declines in the United States and Europe, as well as developed economies in Asia.

Oil shale industry

The oil shale industry is an industry of mining and processing of oil shale—a fine-grained sedimentary rock, containing significant amounts of kerogen, from which liquid hydrocarbons can be manufactured. The industry has developed in Brazil, China, Estonia and to some extent in Germany and Russia. Several other countries are currently conducting research on their oil shale reserves and production methods to improve efficiency and recovery. Estonia accounted for about 70% of the world's oil shale production in a study published in 2005.

Shale oil extraction Process for extracting oil from oil shale

Shale oil extraction is an industrial process for unconventional oil production. This process converts kerogen in oil shale into shale oil by pyrolysis, hydrogenation, or thermal dissolution. The resultant shale oil is used as fuel oil or upgraded to meet refinery feedstock specifications by adding hydrogen and removing sulfur and nitrogen impurities.

Predicting the timing of peak oil

Peak oil is the point at which oil production, sometimes including unconventional oil sources, hits its maximum. Predicting the timing of peak oil involves estimation of future production from existing oil fields as well as future discoveries. The most influential production model is Hubbert peak theory, first proposed in the 1950s. The effect of peak oil on the world economy remains controversial.

Sustainability metrics and indices are measures of sustainability, and attempt to quantify beyond the generic concept. Though there are disagreements among those from different disciplines, these disciplines and international organizations have each offered measures or indicators of how to measure the concept.

This page is an index of sustainability articles.

The reserves-to-production ratio is the remaining amount of a non-renewable resource, expressed in time. While applicable to all natural resources, the RPR is most commonly applied to fossil fuels, particularly petroleum and natural gas. The reserve portion (numerator) of the ratio is the amount of a resource known to exist in an area and to be economically recoverable. The production portion (denominator) of the ratio is the amount of resource produced in one year at the current rate.

Peak minerals marks the point in time when the largest production of a mineral will occur in an area, with production declining in subsequent years. While most mineral resources will not be exhausted in the near future, global extraction and production is becoming more challenging. Miners have found ways over time to extract deeper and lower grade ores with lower production costs. More than anything else, declining average ore grades are indicative of ongoing technological shifts that have enabled inclusion of more 'complex' processing – in social and environmental terms as well as economic – and structural changes in the minerals exploration industry and these have been accompanied by significant increases in identified Mineral Reserves.


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