Thought of the day (well yesterday, to be honest) by Rahul Mahajan:

I am sometimes asked, "Do you think there's any hope or is it already too late?" The person asking doesn't have to specify the end of oil, global warming, the battle of Gog and Magog, the building of the Third Temple -- again, it's taken as given that, as Barry McGuire sang in 1965, "we're on the eve of destruction."

Anyway, what I say, to them and to you, is this. It's the wrong question. Hope leaks out every day when we don't take steps to turn the world around. It's never completely gone, but the flip-side is this: you can never recover what was already lost. Whatever catastrophes the future holds for us -- and there are undoubtedly some -- they can be mitigated by a change of course, but it is not possible to start over ab initio, to make things as if we had never started wrecking the planet. Translation: the sooner we get off our asses the better.

Couldn't have put it better myself.