This malthusian crap needs to end. The earth can happily support 8 billion people if we just use a better energy mix. We already (in the US) emit less CO2 than we did in the mid 2000s, and it's only going to keep going down. It's literally financially unreasonable to run coal plants, and the developed world should be doing everything in it's power to fill india and the middle east and africa with solar panels.

With a little help, most of these nations could jump straight past the pollution of a fossil fuel based economy and directly into a renewable/sustainable economy, while only improving their lives.

This is also completely orthogonal to the fact that if you want less people on the earth all you have to do is send women to school, allow them to start a career, and give them easy access to birth control. Population drops pretty reliably after that.