I'm no scientist (and Peter will probably be more able to cite reliable 
sources than I) but I believe the more we encroach on the environment, 
the more species of life are killed off and the less the biodiversity.  
This all means less food supply up and down the food chain and even less 
biodiversity and even less of a food supply for all life forms.

We are already seeing the effects in the vanishing amphibian populations 
and bird populations.

Kat
Michael H. Collis wrote:
> I've been reading the posts about global warming with interest, and I think you've left out something.  How does mankind's encroachment on nature, be it road building, house building, or paving, interact with climate?  I think the greenhouse gases might not be the only thing we have to worry about.
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