Well the Europeans and Japanese are doing their part by reducing their population naturally. The US is only at stable population when you eliminate immigration. Better access to birth control might send the population into reverse.
The Chinese population will start to shrink once it peaks in a few years too.
It is just those Arabs and Africans who can't stop breeding it would seem.
Although I think I just baited a large number of people with that last comment, the reality of my statement is that the richer you get, the greater the likelihood that you population goes down. It also lowers resource use, but could theoretically make you richer per person.
At the end of the day 70 people using 100 units of resources have less per person than 40 people using 80 units even though resource use is lower.
The earth is a paradise with 2 billion people. It will be hell with 10.
Back to the lifeboat theory.
Well, I can agree with you there. I believe that if there IS such a thing as man-made global warming it's because the earth is supporting 6-7 billion people now when it was half that when I was a kid in the 60s.