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The fact is that if you think evolution is true, if we eradicate a wide range of species now, new species will not evolve to replace them for perhaps millions of years.

I think that if something in 'nature' goes extinct for any reason that 'nature' will handle it. Yes all things add up together to form the ecosystem and that changes, sometimes for the worse, when some are removed from the fold. I understand that human action can impact the earth environment in a negative way, but I also see that we impact it in proper ways also. I simply rest on the idea that if humans push to far, 'mother nature' will put us in our place. SARS, HIV and bird flu come to mind. Global warming?? Is this humans driving SUV's or building skyscrapers and using natural gas or coal for energy? Or is this the regular order of things in the universal environment? I stick with the sun over human action causing the changes. Humans are but one spec of life on this planet and we hold no designs on controlling it the way some would like to see it controlled.