"Right now most of the world is living under appalling conditions. We can't possibly improve the conditions of everyone. We can't raise the entire world to the average standard of living in the United States because we don't have the resources and the ability to distribute well enough for that. So right now as it is, we have condemned most of the world to a miserable, starvation level of existence. And it will just get worse as the population continues to go up... Democracy cannot survive overpopulation. Human dignity cannot survive it. Convenience and decency cannot survive it. As you put more and more people onto the world, the value of life not only declines, it disappears. It doesn't matter if someone dies. The more people there are, the less one individual matters."
Video - Bill Moyers interviews Isaac Asimov World of Ideas Part 1.