The only way to stop global climate change is for the human race to revert back to a pre-industrial state. I'm talking medieval, substance farming levels. Otherwise, we just create too much pollution as a species. Of course in order to get to a sustainable state like that we are going to need to let a couple of billion people die. Two-thirds of the earth's population should do, get to the right level and just stay there. No more progress, no more striving for something new. Just maintain the status quo, people can live to the ripe old age of mid-thirties then die.