Ecological footprint

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World map of countries by their raw ecological footprint, relative to the world average biocapacity (2007) World map of countries by ecological footprint (2007).svg
World map of countries by their raw ecological footprint, relative to the world average biocapacity (2007)
National ecological surplus or deficit, measured as a country's biocapacity per person (in global hectares) minus its ecological footprint per person (also in global hectares). Data from 2013.
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National ecological surplus or deficit, measured as a country's biocapacity per person (in global hectares) minus its ecological footprint per person (also in global hectares). Data from 2013.
        
               
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The ecological footprint is a method promoted by the Global Footprint Network to measure human demand on natural capital, i.e. the quantity of nature it takes to support people or an economy. [2] [3] [4] It tracks this demand through an ecological accounting system. The accounts contrast the biologically productive area people use for their consumption to the biologically productive area available within a region or the world (biocapacity, the productive area that can regenerate what people demand from nature). In short, it is a measure of human impact on the environment.

Contents

Footprint and biocapacity can be compared at the individual, regional, national or global scale. Both footprint and biocapacity change every year with number of people, per person consumption, efficiency of production, and productivity of ecosystems. At a global scale, footprint assessments show how big humanity's demand is compared to what Earth can renew. Global Footprint Network estimates that, as of 2014, humanity has been using natural capital 1.7 times as fast as Earth can renew it, which they describe as meaning humanity's ecological footprint corresponds to 1.7 planet Earths. [1] [5] [6]

Ecological footprint analysis is widely used around the world in support of sustainability assessments. [7] It enables people to measure and manage the use of resources throughout the economy and explore the sustainability of individual lifestyles, goods and services, organizations, industry sectors, neighborhoods, cities, regions and nations. [2]

Overview

The first academic publication about ecological footprints was by William Rees in 1992. [8] The ecological footprint concept and calculation method was developed as the PhD dissertation of Mathis Wackernagel, under Rees' supervision at the University of British Columbia in Vancouver, Canada, from 1990 to 1994. [9] Originally, Wackernagel and Rees called the concept "appropriated carrying capacity". [10] To make the idea more accessible, Rees came up with the term "ecological footprint", inspired by a computer technician who praised his new computer's "small footprint on the desk". [11] In 1996, Wackernagel and Rees published the book Our Ecological Footprint: Reducing Human Impact on the Earth. [12]

The simplest way to define ecological footprint is the amount of the environment necessary to produce the goods and services necessary to support a particular lifestyle. [13]

The model is a means of comparing consumption and lifestyles, and checking this against biocapacity. The tool can inform policy by examining to what extent a nation uses more (or less) than is available within its territory, or to what extent the nation's lifestyle would be replicable worldwide. The footprint can also be a useful tool to educate people about overconsumption, with the aim of altering personal behavior. Ecological footprints may be used to argue that many current lifestyles are not sustainable. Country-by-country comparisons show the inequalities of resource use on this planet.

The GHG footprint or the more narrow carbon footprint are a component of the ecological footprint. Often, when only the carbon footprint is reported, it is expressed in weight of CO2 (or CO2e representing GHG warming potential (GGWP)), but it can also be expressed in land areas like ecological footprints. Both can be applied to products, people or whole societies. [14]

Methodology

The natural resources of Earth are finite, and unsustainable given current levels of use. Blue Marble Western Hemisphere.jpg
The natural resources of Earth are finite, and unsustainable given current levels of use.

The focus of ecological footprint accounting is renewable resources. The total amount of such resources which the planet produces according to this model has been dubbed biocapacity. Ecological footprints can be calculated at any scale: for an activity, a person, a community, a city, a town, a region, a nation, or humanity as a whole. Footprint values are categorized for carbon, food, housing, goods and services. This approach can be applied to an activity such as the manufacturing of a product or driving of a car. This resource accounting is similar to life-cycle analysis wherein the consumption of energy, biomass (food, fiber), building material, water and other resources are converted into a normalized measure of land area called global hectares (gha).[ citation needed ]

Since 2003, Global Footprint Network has calculated the ecological footprint from UN data sources for the world as a whole and for over 200 nations (known as the National Footprint Accounts). The total footprint number of Earths needed to sustain the world's population at that level of consumption are also calculated. Every year the calculations are updated to the latest year with complete UN statistics. The time series are also recalculated with every update since UN statistics sometimes correct historical data sets. Results are available on an open data platform. [1] Lin et al. (2018) finds that the trends for countries and the world have stayed consistent despite data updates. [5] Also, a recent study by the Swiss Ministry of Environment independently recalculated the Swiss trends and reproduced them within 1–4% for the time period that they studied (1996–2015). [15] Since 2006, a first set of ecological footprint standards exist that detail both communication and calculation procedures. The latest version are the updated standards from 2009. [16]

The ecological footprint accounting method at the national level is described on the website of Global Footprint Network [16] or in greater detail in academic papers, including Borucke et al. [17]

The National Accounts Review Committee has published a research agenda on how to improve the accounts. [18]

Footprint measurements

Ecological footprints in 2018 How many earths 2018 English.jpg
Ecological footprints in 2018

For 2017 Global Footprint Network estimated humanity's ecological footprint as 1.73 planet Earths. According to their calculations this means that humanity's demands were 1.73 times more than what the planet's ecosystems renewed. [1] [5]

In 2007, the average biologically productive area per person worldwide was approximately 1.8 global hectares (gha) per capita. The U.S. footprint per capita was 9.0 gha, and that of Switzerland was 5.6 gha, while China's was 1.8 gha. [19] [20] The WWF claims that the human footprint has exceeded the biocapacity (the available supply of natural resources) of the planet by 20%. [21] Wackernagel and Rees originally estimated that the available biological capacity for the 6 billion people on Earth at that time was about 1.3 hectares per person, which is smaller than the 1.8 global hectares published for 2006, because the initial studies neither used global hectares nor included bioproductive marine areas. [12]

Ecological Footprint per person and HDI of countries by world regions (2014) and its natural resource consumption Ecological Footprint per person and HDI of countries by world regions (2014).jpg
Ecological Footprint per person and HDI of countries by world regions (2014) and its natural resource consumption

According to the 2018 edition of the National footprint accounts, humanity's total ecological footprint has exhibited an increasing trend since 1961, growing an average of 2.1% per year (SD= 1.9). [5] Humanity's ecological footprint was 7.0 billion gha in 1961 and increased to 20.6 billion gha in 2014. [5] The world-average ecological footprint in 2014 was 2.8 global hectares per person. [5] The carbon footprint is the fastest growing part of the ecological footprint and accounts currently for about 60% of humanity's total ecological footprint. [5]

The Earth's biocapacity has not increased at the same rate as the ecological footprint. The increase of biocapacity averaged at only 0.5% per year (SD = 0.7). [5] Because of agricultural intensification, biocapacity was at 9.6 billion gha in 1961 and grew to 12.2 billion gha in 2016. [5]

According to Wackernagel and his organisation, the Earth has been in "overshoot", where humanity is using more resources and generating waste at a pace that the ecosystem cannot renew, since the 1970s. [5] In 2018, Earth Overshoot Day, the date where humanity has used more from nature than the planet can renew in the entire year, was estimated to be August 1. [23] In 2020, because of reduction in resource demand due to COVID-19 lockdowns, Earth Overshoot Day was delayed to August 22. [24] Now more than 85% of humanity lives in countries that run an ecological deficit. [2]

According to Rees, "the average world citizen has an eco-footprint of about 2.7 global average hectares while there are only 2.1 global hectare of bioproductive land and water per capita on earth. This means that humanity has already overshot global biocapacity by 30% and now lives unsustainabily by depleting stocks of 'natural capital'." [25]

Footprint by country

Ecological footprint for different nations compared to their Human Development Index Human welfare and ecological footprint sustainability.jpg
Ecological footprint for different nations compared to their Human Development Index

The world-average ecological footprint in 2013 was 2.8 global hectares per person. [5] The average per country ranges from over 10 to under 1 global hectares per person. There is also a high variation within countries, based on individual lifestyle and economic possibilities. [2]

The Western Australian government State of the Environment Report included an Ecological Footprint measure for the average Western Australian seven times the average footprint per person on the planet in 2007, a total of about 15 hectares. [26]

The figure (right) examines sustainability at the scale of individual countries by contrasting their Ecological Footprint with their UN Human Development Index (a measure of standard of living). The graph shows what is necessary for countries to maintain an acceptable standard of living for their citizens while, at the same time, maintaining sustainable resource use. The general trend is for higher standards of living to become less sustainable. As always, population growth has a marked influence on levels of consumption and the efficiency of resource use. [27] [28] :45 The sustainability goal is to raise the global standard of living without increasing the use of resources beyond globally sustainable levels; that is, to not exceed "one planet" consumption. The information generated by reports at the national, regional and city scales confirm the global trend towards societies that are becoming less sustainable over time. [29] [30]

Studies in the United Kingdom

The UK's average ecological footprint is 5.45 global hectares per capita (gha) with variations between regions ranging from 4.80 gha (Wales) to 5.56 gha (East England). [20]

BedZED, a 96-home mixed-income housing development in South London, was designed by Bill Dunster Architects and sustainability consultants BioRegional for the Peabody Trust. Despite being populated by relatively average people, BedZED was found to have a footprint of 3.20 gha (not including visitors), due to on-site renewable energy production, energy-efficient architecture, and an extensive green lifestyles program that included London's first carsharing club.[ citation needed ] Findhorn Ecovillage, a rural intentional community in Moray, Scotland, had a total footprint of 2.56 gha, including both the many guests and visitors who travel to the community. However, the residents alone had a footprint of 2.71 gha, a little over half the UK national average and one of the lowest ecological footprints of any community measured so far in the industrialized world. [31] [32] Keveral Farm, an organic farming community in Cornwall, was found to have a footprint of 2.4 gha, though with substantial differences in footprints among community members. [33]

Ecological footprint at the individual level

Ecological Footprint per person and HDI of countries by world regions (2014) Ecological Footprint per person and HDI of countries by world regions (2014).jpg
Ecological Footprint per person and HDI of countries by world regions (2014)

In a 2012 study of consumers acting 'green' vs. 'brown' (where green people are "expected to have significantly lower ecological impact than 'brown' consumers"), the conclusion was "the research found no significant difference between the carbon footprints of green and brown consumers". [34] [35] A 2013 study concluded the same. [36] [37]

Reviews and critiques

Early criticism was published by van den Bergh and Verbruggen in 1999, [38] [39] which was updated in 2014. [40] Their colleague Fiala published similar criticism in 2008. [41]

A comprehensive review commissioned by the Directorate-General for the Environment (European Commission) was published in June 2008. The European Commission's review found the concept unique and useful for assessing progress on the EU’s Resource Strategy. They also recommended further improvements in data quality, methodologies and assumptions. [42]

Blomqvist et al. [43] published a critical paper in 2013. It led to a reply from Rees and Wackernagel (2013), [44] and a rejoinder by Blomqvist et al. (2013). [45]

An additional strand of critique is from Giampietro and Saltelli (2014), [46] with a reply from Goldfinger et al., 2014, [47] and a rejoinder by Giampietro and Saltelli (2014). [48] A joint paper authored by the critical researchers (Giampietro and Saltelli) and proponents (various Global Footprint Network researchers) summarised the terms of the controversy in a paper published by the journal Ecological indicators. [49] Additional comments were offered by van den Bergh and Grazi (2015). [50]

A number of national government agencies have performed collaborative or independent research to test the reliability of the ecological footprint accounting method and its results. [51] They have largely confirmed the accounts' results; those who reproduced the assessment generating near-identical results. Such reviews include those of Switzerland, [52] [53] Germany, [54] France, [55] Ireland, [56] the United Arab Emirates [57] and the European Commission. [58] [59]

Global Footprint Network has summarized methodological limitations and criticism in a comprehensive report available on its website. [60]

Some researchers have misinterpreted ecological footprint accounting as a social theory or a policy guideline, while in reality it is merely a metric that adds up human demands that compete for the planet's regenerative capacity. Examples of such confusions include Grazi et al. (2007) who performed a systematic comparison of the ecological footprint method with spatial welfare analysis that includes environmental externalities, agglomeration effects and trade advantages. Not recognizing that the ecological footprint is merely a metric, they conclude that the footprint method does not lead to maximum social welfare. [61] Similarly, Newman (2006) has argued that the ecological footprint concept may have an anti-urban bias, as it does not consider the opportunities created by urban growth. [62] He argues that calculating the ecological footprint for densely populated areas, such as a city or small country with a comparatively large population—e.g. New York and Singapore respectively—may lead to the perception of these populations as "parasitic". But in reality, ecological footprints just document the resource dependence of cities—like a fuel gauge documents a car's fuel availability. Newman questions the metric because these communities have little intrinsic biocapacity, and instead must rely upon large hinterlands . Critics argue that this is a dubious characterization since farmers in developed nations may easily consume more resources than urban inhabitants, due to transportation requirements and the unavailability of economies of scale. Furthermore, such moral conclusions seem to be an argument for autarky. This is similar to blaming a scale for the user's dietary choices. Some even take this train of thought a step further, claiming that the footprint denies the benefits of trade. Therefore such critics argue that the footprint can only be applied globally. [63] Others have made the opposite argument showing that national assessments do provide helpful insights. [64]

Since this metric tracks biocapacity, the replacement of original ecosystems with high-productivity agricultural monocultures can lead to attributing a higher biocapacity to such regions. For example, replacing ancient woodlands or tropical forests with monoculture forests or plantations may therefore decrease the ecological footprint. Similarly if organic farming yields were lower than those of conventional methods, this could result in the former being "penalized" with a larger ecological footprint. [65] Complementary biodiversity indicators attempt to address this. The WWF's Living Planet Report combines the footprint calculations with the Living Planet Index of biodiversity. [66] A modified ecological footprint that takes biodiversity into account has been created for use in Australia. [67]

See also

Related Research Articles

Natural capital

Natural capital is the world's stock of natural resources, which includes geology, soils, air, water and all living organisms. Some natural capital assets provide people with free goods and services, often called ecosystem services. All of these underpin our economy and society, and thus make human life possible.

I = PAT

I = (PAT) is the mathematical notation of a formula put forward to describe the impact of human activity on the environment.

Overconsumption describes a situation where the use of a natural resource has exceeded the sustainable capacity of a system. A prolonged pattern of overconsumption leads to the eventual loss of resource bases. The term overconsumption is quite controversial in use and does not necessarily have a single unifying definition. Overconsumption is driven several factors of the current global economy, including forces like consumerism, planned obsolescence, and other unsustainable business models and can be contrasted with sustainable consumption.

William E. Rees

William Rees, FRSC, is Professor Emeritus at the University of British Columbia and former director of the School of Community and Regional Planning (SCARP) at UBC.

Human overpopulation Condition where human numbers exceed the short or long-term carrying capacity of the environment

Human overpopulation is the concept of a human population becoming too large to be sustained by its environment or resources in the long term. The idea is usually discussed in the context of world population, though it may also concern regions. Human population growth has increased in recent centuries due to medical advancements and improved agricultural productivity. Those concerned by this trend argue that it results in a level of resource consumption which exceeds the environment's carrying capacity, leading to population overshoot. The concept is often discussed in relation to other population concerns such as demographic push and depopulation, as well as in relation to resource depletion and the human impact on the environment.

The global hectare (gha) is a measurement unit for the ecological footprint of people or activities and the biocapacity of the earth or its regions. One global hectare is the world's annual amount of biological production for human use and human waste assimilation, per hectare of biologically productive land and fisheries.

Mathis Wackernagel is a Swiss-born sustainability advocate. He is President of Global Footprint Network, an international sustainability think tank with offices in Oakland, California; Brussels, Belgium, and Geneva, Switzerland. The think-tank is a non-profit that focuses on developing and promoting metrics for sustainability.

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.

Sustainability Process of maintaining change in a balanced fashion

Sustainability is the capacity to endure in a relatively ongoing way across various domains of life. In the 21st century, it refers generally to the capacity for Earth's biosphere and human civilization to co-exist. For many, sustainability is defined through the interconnected domains of environment, economy and society. Despite the increased popularity of the term "sustainability" and its usage, the possibility that human societies will achieve environmental sustainability has been, and continues to be, questioned—in light of environmental degradation, biodiversity loss, climate change, overconsumption, population growth and societies' pursuit of unlimited economic growth in a closed system.

Water footprint Extent of water use in relation to consumption by people

A water footprint shows the extent of water use in relation to consumption by people. The water footprint of an individual, community, or business is defined as the total volume of fresh water used to produce the goods and services consumed by the individual or community or produced by the business. Water use is measured in water volume consumed (evaporated) and/or polluted per unit of time. A water footprint can be calculated for any well-defined group of consumers or producers, for a single process or for any product or service.

In environmental science, the concept of overshoot means demand in excess of regeneration. It can apply to animal populations and people. Environmental science studies to what extent human populations through their resource consumption have risen above the sustainable use of resources. For people, "overshoot" is that portion of their demand or ecological footprint which must be eliminated to be sustainable. Excessive demand leading to overshoot is driven by both consumption and population.

Earth Overshoot Day (EOD) is the calculated illustrative calendar date on which humanity's resource consumption for the year exceeds Earth’s capacity to regenerate those resources that year. The term "overshoot" represents the level by which human population's demand overshoots the sustainable amount of biological resources regenerated on Earth. When viewed through an economic perspective, the annual EOD represents the day by which the planet's annual regenerative budget is spent, and humanity enters environmental deficit spending. EOD is calculated by dividing the world biocapacity, by the world ecological footprint, and multiplying by 365, the number of days in a year:

The history of sustainability traces human-dominated ecological systems from the earliest civilizations to the present day. This history is characterized by the increased regional success of a particular society, followed by crises that were either resolved, producing sustainability, or not, leading to decline. In early human history, the use of fire and desire for specific foods may have altered the natural composition of plant and animal communities. Between 8,000 and 12,000 years ago, agrarian communities emerged which depended largely on their environment and the creation of a "structure of permanence."

Global Footprint Network

Global Footprint Network, founded in 2003, is an independent think tank originally based in the United States, Belgium and Switzerland. It was established as a charitable not-for-profit organization in each of those three countries.

The biocapacity or biological capacity of an ecosystem is an estimate of its production of certain biological materials such as natural resources, and its absorption and filtering of other materials such as carbon dioxide from the atmosphere.

Land footprint is the real amount of land, wherever it is in the world, that is needed to produce a product, or used by an organisation or by a nation.

Quantitative storytelling (QST) is a systematic approach used to explore the multiplicity of frames potentially legitimate in a scientific study or controversy. QST assumes that in an interconnected society multiple frameworks and worldviews are legitimately upheld by different entities and social actors. QST looks critically on models used in evidence-based policy (EBP. Such models are often reductionist, in the sense discussed by, in that tractability is achieved at the expenses of suppressing relevant available evidence. QST suggests corrective approaches to this practice.

Ecological overshoot

Ecological overshoot is the phenomenon which occurs when the demands made on a natural ecosystem exceeds its regenerative capacity. Global ecological overshoot occurs when the demands made by humanity exceed what the biosphere of Earth can provide through its capacity for renewal.

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Further reading