http://www.theoildrum.com/node/3188This is a guest post by John Feeney, Ph.D. Trained as a psychologist, John is today an environmental writer and activist in Boulder, Colorado. He began investigating environmental issues while fighting destructive residential development in a small Iowa town where he and his family lived for two years. His research pointed inevitably to the interacting roles played by population growth, the drive for economic growth, and our reliance on fossil energy in fueling the ecological crisis we now face. His website is called Growth Is Madness (http://growthmadness.org/)"Some of us who examine and discuss environmental matters are constantly puzzled and frustrated by the seeming inability of elected officials, environmental organizations, and environmental and political writers to “get” the nature of our ecological plight. Could it be they’re simply unaware of the ecological principles which enable one to understand it?
Since some undoubtedly are getting it, and in light of the warnings in the UN’s latest report on the state of the global environment, below is a brief list of
axioms and observations from population ecology with which everyone should be familiar. Most are taught in introductory level ecology and environmental science classes. They appear sequentially, so the reader can step logically through a progression which should make clear the nub of the global ecological challenge before us...
(NOTE: presented in summary form) . . .1. A finite earth can support only a limited number of humans.
2. It is an axiom of ecological science that a population which has grown larger than the carrying capacity of its environment (e.g., the global ecosystem) degrades its environment.
3. A SELF-EVIDENT TRUTH: If any fraction of the observed global warming can be attributed to the activities of humans, then this constitutes positive proof that the human population, living as we do, has exceeded the carrying capacity of the Earth.
4. It’s axiomatic, as well, that a population can only temporarily overshoot carrying capacity.
5. Because it degrades it’s environment, a population in overshoot erodes existing carrying capacity so that fewer members of that species will be supported by that habitat in the future.
6. Our extraction of nonrenewable resources such as oil and coal has allowed us temporarily to exceed the earth’s carrying capacity for our species.http://www.theoildrum.com/node/3188