>> ...if you want to maintain ecological systems in their current form, one needs to reduce the impact of human beings on them by some metric;"
Reminds me of a book:
[link|http://www.amazon.com/gp/product/074320011X/sr=8-1/qid=1144206877/ref=pd_bbs_1/103-8304407-9643852?%5Fencoding=UTF8|http://www.amazon.co...?%5Fencoding=UTF8]
Parasite Rex : Inside the Bizarre World of Nature's Most Dangerous Creatures
from Publisher's Weekly:
"Not only are parasites not all bad, Zimmer concludes in this exemplary work of popular science, but we may be parasites, too and we have a lot to learn from them about how to manage earth, the host we share."
Fascinating book.