GRA wrote:The sheer number of humans on the planet, along with their high densities, is the underlying cause of all major human-based environmental impacts.
Disagree. It's a contributing factor, combined with our high-consumption way of life. But it is not the cause.
GRA wrote:It may be possible to eliminate the deleterious environmental effects of large numbers of humans at high density, but it will always be easier to do so if the numbers and densities are smaller. Since we don't yet have the ability to eliminate those effects, our only other option is to reduce the size of the problems by reducing the number of people contributing to them.
As to eliminating the human race entirely from the earth, there are more than a few scientists who've pointed out that our survival as a species isn't required; it's our egos that make us think our continuation is important. In short, it matters to us, but the earth would get along just fine without us, as it did for the several billion years before we arrived.
Let's just say that you and I have very different views on our purpose here. We don't exist to support the earth. The earth exists to support us.
Of course the earth could and would go on without us. In fact, I said as much in my post. But that's not the point. We should care about the earth's ability to support us. That's the whole point - to allow the earth to continue to support human life.