World's got too many bloody people in it already. I agree with the Chinese government - one child per family until we get things stabilized. Too many people + Finite resources means that someone's going to be left with no pie at the end of the day. If you want EVERYONE to live like an American, with today's population, you'd need 1.5 more planet Earths. There's simply too little to allow everyone to have a good life. There's probably enough for everyone to have A life, but not enough for everyone to have what we in the west would consider a comfortable life.
The only way to have a world in which EVERYONE has abundant resources is to limit how many bloody people live on this ball of rock. I'm doing my part - I'm not reproducing or having ANY children. The world only needs about 1 billion people, and we've got nearly 7 BILLION. That's too many, far too many.
And if you really want kids - why not adopt? The damage has already been done, they've already been born, so we can't undo their birth (without being completely, horribly evil) so DON'T have kids - adopt someone else's. You'll be giving a child a good life while not contributing to the bane of over-population.