Post-Dispatch: After decades of contentious and often acrimonious negotiations, the nations of the world have come together with an agreement that places our civilization on a path toward avoiding the worst effects of climate change. The Paris accord is one of those rare moments when every nation acknowledges that, for the good of all, we must act as one. It was a wonderful surprise that after the incredible disappointment of Copenhagen, these 195 countries could come to an agreement more ambitious than anyone...