"I'll just point out that most current extinctions have more to do with habitat destruction than pollution/global-warming. The only possible link between global warming and species collapse I know of is coral blanching (read: coral dies and becomes white because of changes in water temperature)."

Actually the mass dying off of krill in the oceans is directly related to the ozone layer holes over the poles. This impacts on massive oceanic ecosystems. Global warming is also changing vegetation patterns worldwide, impacting directly on the animals inhabiting them. El Nino and the Atlantic gulf Streams motions are also effected by global warming, devestating areas. The link couldn't be clearer or more obvious.