Our influence has simply accelerated the time frame
To paraphrase Joe Turkel in "The Blade Runner" . . .
The light that burns twice as bright, burns twice as fast
And (we humans) have burned so very, very, brightly
Other life forms have poisoned their environment and failed
Humans have just done it so very, very quickly
Peace,
dave
The environment can, and will recover. Even the worst polluted areas in the world, will for the most part revert to nature just fine within several decades, and certainly within centuries.
Take a look at Chernobyl for instance. While it's true that long term exposure for us is problematic to say the least, both flora and fauna are thriving there now. Interestingly enough, in a lot of ways it's now the perfect nature preserve.
Yes I'm sure that there are effects from the radiation, and that they are detrimental... but for the most part, even that area, that place, has not been sterilized.
So the question is not whether the environment would survive, but rather, would we survive in the new environment.
With that consideration out of the way though, still, our impact is not nearly as severe as we would like to think.
Natural processes, the gulf stream, volcanic eruptions, sunspot activity, all of these can, and do affect the environment more than we can. We are quite literally scratching the earth's surface.
So while I certainly agree, we should all try to be more environmentally friendly, conserve energy, try to produce less trash, etc, I don't think we should fool ourselves into foolhardy ultimately wasteful endeavours like the dozens of failed companies our government paid for to develop "clean, renewable energy" nor panic over climate change clamoring for change, for the sake of change alone.
Considering where this conversation started, (ethanol, oil,) I think it is a great failure that instead of investing in further efficiency for things like the power supply grid, power production, and working on cars that are already on the road, our government instead pushes "green" cars green companies, subsidizing things like the chevy volt, to the tune of hundreds of thousands, per car.