Well sorry for my mistake then.
I'd say the number of humans is only one part of the problem, the other being our life style. But I'm not against all kinds of population control. The best kind of population control is to provide education and contraception to women everywhere and that's something I'm all for and so are you IIRC.
Beside, if I was some kind of psychopath with too much power and I really wanted to exterminate a large percentage of the population to solve the ecological problem, don't you think a gendercide would make more sense? I'm sure sperm wouldn't be that hard to clone in a lab so if we killed every men then it would be very easy to control birth. Lets exterminate the all Y chromosome. This way we never have any accidental pregnancy and and since it's easier to have a centralized control over sperm banks than to control people's sex life, it would make eugenics so much easier. Only allow women who have completed college and who have no criminal record to get pregnant and with centuries humanity should become better at learning and more law abiding. Dang, what a great idea for a scfi novel.