@samanthac,
Straw man . . . i haven't said we will be here thousands of years from now. Your hubris, however, is hilarious. Short of a thermonuclear event which were to turn the planet into an asteroid belt, there is no good reason to assume that we can destroy the environment. If, for example, we were to so poison the air and water that we could not survive, the planet would have cleaned up after us in a few decades, never mind centuries. You really overrate the significance of the human race.