Yes, it's hard for me to believe, it should be hard for you to believe, too. I believe that you think you came up with it on your own, through common sense. But this is an old fish that's been thrown around since before the 1968 book The Population Bomb. Eugenics and other lovely philosophies have been around much longer. Star Trek used them both as themes. Is it plain old common sense that, say, there could very well be a point when the Earth can't sustain its population of, say, insects? Lots more of them than us. Bacteria? But I'm guessing those things never occurred to you. The theories you have in your head are not spontaneously generated, they are there because decades of pop culture and education have put them there. There are infants in China that are drowned because of this way of thinking. There are women in Peru who have been forced into sterilization on the U.S. dime because of it. These ideas have history, and they have consequences. Human beings are resources in themselves, not liabilities. Question authority, Swellman.