Good point Rob! Of course the flora and fauna of a country evolves to adapt to the way the land is altered by man. As an aside, in Southern Africa elephants are showing shorter and shorter tusks, and in the females, no tusks. This is because the poachers don't bother to kill small tusked animals.
Ultimately there are too many people and society seems to think the is no limit to resources... discussions on the merits of a particular lifestyle are a bit like watching Rome Burn.
One of my more radical members of the family believes that the earth needs to shed 25 to 30% of the human race to have a hope of long term survival. She hopes of a war between the USA and China followed by a re-run of the 1919 Flu epidemic. It is hard to argue with her logic, but I don't like the consequences.
