"When people think about environmental sustainability, they immediately focus on population."

"Actually, when it comes down to it — it's not how many mouths there are to feed, it's how much flesh there is on the planet."

It's sort of creepy to think of the planet as giant, collected mass of flesh, but... [t]he more you weigh, the more calories you need to move around and the more resources you use up in general. So, in that respect, the fatter you are, the more you tax the planet....

I've been on this topic for years, actually. Read my classic post: "If you really believed in global warming, you would turn off your air conditioning," which has a list of things people would do if they were serious about the environmentalism they preach. #1 is "Your weight should be at the low end of normal, indicating that you are not overconsuming the products of agriculture."