It is because of overpopulation (not talking about running out of food here) that forces us humans to change our way of lives. We need to farm our land more intensively using more fertilizer and pesticides, clear more land for farming, build more cars and trucks and ships to transport the goods, mine for more minerals, extract more coal. It is not mindless industrialization. You added another billion people on earth and just see how many factories and farms you need just to feed, cloth, house and move them about. People are just looking at green house gasses but there is degradation of env everywhere. However when you talk about pop control you meet opposition from many religious groups.