Add to that that the random choice of 400 ppm as the goal to stay below is based on extrapolating conditions in the Pliocene (the last time CO2 was above 400 ppm) as if the same environment would result today, ignoring that the Great Plains were in fact a shallow ocean at the time, the continents were configured differently and there was a great deal more vulcanism going on in the worldThere is nothing in it, the belief of fanatics harvested to make coin for the few. When I get the arguments about climate change and man's contribution I always ask HOW MUCH? Can't quantify it? Then it's really just a belief, a religion, a cult. Carbon foot prints make as much sense as Bigfoot foot prints.