Too Many People, Too Much Consumption. Arrowjep. Bruche Environnement, croissance, économie, énergie, écologie, ressources, population, démographie, malthusianisme, Club de Rome, Malthus, Jacques-Yves Cousteau, Anton Zischka, René Dumont, Michel Godet, Humanae Vitae, Jancovici, Malthus, Anton ZISCHKA, P. Paul Ehrlich Equation. Where: I is the impact on the environment resulting from consumption P is the population number A is the consumption per capita (affluence) T is the technology factor Preventing I to increase due to growing consumption (P*A) requires the technology factor T to be reduced - i.e. resource productivity (or eco-efficiency) to be improved.
In a UNEP report of April 2002, "Sustainable consumption: A Global Status Report", it says under the heading 'The Consumption Equation': The relationship between population, consumption and environmental impact can be described in approximate terms by an equation first proposed by Ehrlich and Holdren in 1971: TEI = P x UC/hp x EE -1 where TEI is total environmental impact, P is population, UC/hp is (average) units of consumption of products and services per head of population and EE is the environmental efficiency of the production, use and disposal of those units.
I PAT. In words: Human Impact (I) on the environment equals the product of P= Population, A= Affluence, T= Technology. This describes how our growing population, affluence, and technology contribute toward our environmental impact. The equation was developed in the 1970s during the course of a debate between Barry Commoner, Paul R. Ehrlich and John Holdren. The equation can aid in understanding some of the factors affecting human impacts on the environment.[4] The Kaya identity is closely related to the I = PAT equation. Population[edit] Population (est.) 10,000 BC – 2000 AD.
In the I=PAT equation, the variable P represents the population of an area, such as the world. The United Nations and the US Census Bureau project that world population will increase from 7.0 billion today to about 9.2 billion by 2050.[5][6] These projections take into consideration that population growth has slowed in recent years as humans are having fewer children. Environmental Impacts[edit] Affluence[edit] Technology[edit] Ehrlich: carbon, growth, consequences « Carbon Offsets Daily. | Sourced From Canada.com | During the 1960s, when Drs.
Paul Ehrlich and John Holdren were trying to anticipate the ultimate consequences of perpetual economic growth, they decided to try quantifying the process. Their intention was to give some mathematical figures to those economists who believed that a finite world could accommodate an indefinite expansion of production and consumption. The result was the Ehrlich Equation. The equation is very simply written as I = PAT, where the impact of human economic activity on the planet (I) is equal to the size of the population (P), times its affluence (A) measured in dollars, times the technology (T), which is determined by the amount of carbon dioxide required to produce $1,000 of Gross Domestic Product. The equation works amazingly well because each of the components in the calculation can be adjusted to reflect changing circumstances. Modern economics, however, is founded on the assumption of increasing consumption and affluence. Proposal of environmental impact indicator or Ehrlich Equation’s modified on Environmental Expert.