by MonteQuest » Sat 01 Dec 2007, 21:19:13
$this->bbcode_second_pass_quote('Lighthouse', ' ')Sorry Monte but I can't find any reference to this term.
"Pherology is defined as the science of the human carrying capacity of the Earth or specific parts of the Earth. Pherologists define carrying capacity as the human population that can be supported in a given territory, in a specified lifestyle (normally the one to which people may resonably aspire), without degrading their physical, ecological and social environment, and without imposing wastes on the global environment beyond a specified (or internationally agreed) limit." (Excerpt from The Pherologist newsletter).
$this->bbcode_second_pass_quote('', 'T')he Ideological Basis of Pherology
The word "pherology" comes from the greek "pherein" meaning "to bear, or carry". It was coined by members of the Optimum Population Trust and refers to the notion of "carrying capacity". Pherologist refers to an "ecological demographer".5 Pherology
attempts to measure the amount of biologically productive land and biodiversity required to sustain human and other populations within a given economy. Depending on the values and sophistication of the model, biodiversity for its own sake may be
allocated from around 12.5% to upwards of 50% of world space. A simple concept was first popularised by Paul Ehrlich, in the late 1960s. A more complex model - the Ecological Footprint - was developed in the 1990s by William Rees and Mathis
Wackernagel in Canada. This latter pherological method and movement has now extended to many different countries and includes books, footprint sites, projects and email study groups in several languages.
I=PAT and The Ecological Footprint
The major popular forerunner to the Ecological Footprint and other pherological explanations and methodologies was the I=PAT formula. This formula was coined by Paul Ehrlich, where I = Environmental Impact, P = Population Numbers, A =
Affluence, T = Technology.6 It means that Environmental Impact is equal to the number of people multiplied by the amount of energy and other resources they consume multiplied by the kind of technology they use to consume and produce.
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$this->bbcode_second_pass_quote('', 'P')lease explain the following carrying capacity estimates. They are all from your sources:
Meadows et. al. (1992): 7.7 billion