Environmental footprint

The phrase "environmental footprint" is a metaphor used to depict the amount of land and water area a human population would hypothetically need to provide the resources required to support itself and to absorb its wastes, given prevailing environmental technology. The term was first coined in 1992 by Canadian ecologist and professor at the University of British Columbia, William Rees.

Footprinting is now widely used around the globe as an indicator of environmental sustainability. It can be used to measure and manage the use of resources throughout the economy. It is commonly used to explore the sustainability of individual lifestyles, goods and services, organizations, industry sectors, neighborhoods, cities, regions and nations.

It measures the people's demand on nature and compares human consumption of natural resources with the earth's ecological capacity to regenerate them. Human footprint has exceeded the biocapacity of the planet by 25%.

Ecological footprint analysis
Ecological footprint analysis approximates the amount of ecologically productive land, sea and other water mass area required to sustain a population, manufacture a product, or undertake certain activities, by accounting the use of energy, food, water, building material and other consumables. The calculations used typically convert this into a measure of land area used in 'global hectares' (gha) per person.

It is a way of determining relative consumption for the purpose of educating people about their resource use and, sometimes, triggering them to alter their over-consumption]. It can be combined with [[Wikipedia:overpopulation|overpopulation concerns and stated as "the number of Earths it would take to support every human living exactly the way you do." Ecological footprints is used to argue that current lifestyles are not sustainable development. For example, the average "earthshare" available to each human citizen is approximately 1.9 gha per capita. The US average footprint is 9.5 gha per capita, and that of Wikipedia:Switzerland:Switzerland 4 gha, whilst China's is circa 1.5 gha per head.

A number of NGO websites allow estimation of one's ecological footprint (see Footprint Calculator, below).

Changing consumption patterns
It is human use of renewable resources, not of non-renewable ones, at a rate beyond their carrying capacity, that poses the real sustainability crisis. Nature can restore renewable resources at a certain rate. Humans consistently and increasingly consume renewables faster than and can replenish them.

This state of excessive ecological burden eventually threatens those very ecosystems by not allowing them sufficient time to "recharge." Furthermore, humans can clearly live without nonrenewable resources such as metals or fossil fuels, as we have done in the not-so-distant past. It is the renewable resource base on which we and all species depend. The ecological footprint approach can introduce the concept of resource recharge and the rate at which we use resources as key elements in more sustainable human societies. This time element helps us understand that it's not just what we use, or even how much, but how fast, and over what period of time. This meshes with other movements to "slow down" human consumption, choose simple living and help people disengage from that acceleration of actions and expectations that has been a crucial feature of industrial societies.

General

 * Global Footprint Network Ecological Footprint : Overview
 * World Overshoot Day Day on which humanity starts consuming more than nature can regenerate in that year.
 * WWF "Living Planet Report", a biannual calculation of national and global footprints
 * Ecological Footprint Analysis, Footprint of Nations etc
 * Big Picture TV Free video clip of Mathis Wackernagel, co-creator of ecological footprint analysis
 * Best Foot Forward Ecological Footprint experts
 * Ecological Footprint Cartogram

Calculators

 * Redefining Progress - International households
 * Best Foot Forward Ecocal - UK households. WARNING: requires Windows NT or later.
 * University of Sydney Integrated Sustainability Analysis at Australian Conservation Foundation. Excel spreadsheet version
 * EPA Victoria - Australian calculators for home, office, school, retail, or event
 * Powerhouse Museum Eco'tude - Australian schools
 * Ministry for the Environment - New Zealand households