But they're not the same people? I have never met an educated person in ecology that's not worried about overpopulation and overproduction of food. It's all interlaced. Overpopulation leads to overusing land, which leads to topsoil depletion and erosion. A healthy soil is an enormous carbon sink, as are healthy oceans. That's where overfishing and pollution comes in. It is complicated, and it is hard to make predictions because a situation like this has literally never occured before. You're making a lot of generalizations and it doesn't appear that you have actually read into any of it apart from anti-global warming articles.