If I were king, I'd make everyone in America set aside time to watch the first hour of this video. It will change the way you think. Since I'm just a blogger, I expect most people won't, so beneath, I've extracted some of the key slides from Saul Griffith's extraordinary presentation, to give a clear sense of just what an enormous task lies ahead of us this century. Say we decide we want to prevent the climate from entering irreversible feedback loops that spin us into biophysical circumstances our species has never experienced. Seems reasonable, no? To avoid those feedbacks, …