As if humanity is some sort of blight that needs to be eradicated so that the other, peaceful, organisms can live in perfect harmony. Nature is cruel and selfish. I've said this before: if humans are like that, that's nature's own imprint on us, which each creature bears (except maybe for sloths; I just read a funny article about how these German scientists finally gave up after two years in getting this certain sloth to move.) Certainly, if this were to be done we would only be giving other creatures the opportunity to be just as bad, and perhaps (likely?) even worse. This is brought on only by the naive and useless idea that humans = bad and nature = good. It's not that simple, and doesn't get us anywhere. We actually have the capability to do something at least, and I think to even consider just letting ourselves die out would be the sign of highest weakness and irresponsibility.
Imagine someone who's lived, fought, bled, and so on. Say, someone maybe who's lived on the streets, and who's done and suffered some pretty bad things. What were you to think of someone like that if they were to one day say 'hey, I'm a terrible person, and don't deserve to live', and then put a gun to their head and kill themselves? I suppose depending on who you are, and exactly how bad the person was, the responses would vary. But now consider this. What if they were now to say 'hey, I've done some pretty bad things, but I'm going to make up for it; I'm going to do something with myself, and make things better for everyone else', then stand up, and turn their life around. Most people would applaud that. If the two are shown side-by-side, the suicide is rather the weaker option, and is defeatest - and also shows a complete ignorance of the fact that things can, and do, change over the course of time. While it might be cowardly to hold onto life too dearly, it is equal cowardice to flee from it too quickly. This proposition (from what I gather from the way Zeppelin described it, on the premise of 'stop having children to spare the rest of the world'; I didn't go to the webside) is that sort of cowardice. And more than that, it shows irresponsibility, because if we have indeed done such bad things... shouldn't we FIX them, instead of running away? And merely 'dying out' is running away.
Now, I'll not say that people haven't messed up the world. We have, I know that. Global warming, for example. I just saw that one movie 'An Inconvinient Truth' (or most of it; I walked in on my parents watching it, so I didn't see the first bit), and hey, it's a fact. But our responsibility is to do something - that's our gift and duty - and it's not... this. On a side note, after seeing that movie and seeing how Bob Dole talks... damn, that guy would have made a good president, eh? I'm not much up on American politics, as they don't directly affect me, but that guy is ten times the speaker Bush is, and seems more intelligent to boot. I'd have probably voted for him, if I was American.