On the homeless, remember that a good proportion are also military veterans.
Also, more people does not necessarily equate to more damage to the environment. There are other factors.
Yeah, I was overly simplistic. And I do think it is tragic that anyone who served this country in the military should ever be homeless. But in a way they are in the mentally ill category. Not that all veteran's are mentally ill, just that those with depression and PTSD tend to be the ones that are homeless. What a way to thank these soldiers, huh?
And it's true that more people does not necessarily mean more damage but it's certainly positively correlated. The earth is about 1/3 full based on estimated capacity. If we keep growing at the rate we are it could be full in our lifetime. That will put so much stress on the system that I think the consequences could be drastic. I'm really not much of an environmentalist. But I'm a scientist and I think the fact that population growth and associated demand for resources is severly changing the planet is indisputable.