Slashdot had an article a while back, about how humans have a thin layer of bacteria living on them, producing an an assorted amount of smells. Well, the Earth has a thin layer of humans, producing all kinds of shit, from, well, shit, to radioactive stuff. That's just the way it is. Just the very existence of human beings is going to change the planet, for better or for worse. What do you want to do? Tell everyone in China or India to hold their breath for a few minutes each day? Hell, we could nuke China and India, and get rid of a bunch of greenhouse gases producing folks.
Will the Seychelles eventually be flooded over with water? Hell, yeah. But where did you think the story of Noah came about? Places are always get flooded over, buried by volcanoes, etc., etc. Some of them happen because of Mother Nature, some of them happen because of the humans, who are the bacteria living on the skin of the Earth.
"Oh, but the baby polar bears will die!"
Hey, shove it up your hairy ass, Al Gore, the Mammoths died out, with or without the help of humans. That's just the way the world works. We can pollute this Earth until the cows come home . . . maybe humans will survive . . . maybe we won't.
May cockroaches dance on my grave :-)