I have one child. My family continually asks me when we’ll be having another. (Some of them literally tell me I’m obligated to have another child–because apparently, it’s a horrible thing to have an only child.)

I always get pissed off when someone asks me this question, because to me, it’s damned personal. But when I tell them I feel it is immoral to have more than one or two children, they either laugh or look at me as if I told them I like eating feces.

The math really isn’t hard, and even if you don’t want to do that work, you can look at graphs of human population growth and concomitant environmental impacts such as species extinction, rainforest destruction, pollution, and on and on.