Arkady
President
But why present that as the choice? We could, obviously, try to target carbon emissions tailored to keep the global average temperature about where it is now. Assuming the tendency without humans would be heading towards an ice-bound Colorado, that would mean higher CO2 than during prior centuries, to offset cooling factors and reach a neutral state. But it wouldn't mean out-of-control increasing CO2, that would vastly more than offset cooling factors to result in two degrees or more (Celsius) temperature increase over the next century. Right now, the path most experts think we're on is for rapid warming. We could instead get on a path for slow warming, with some practical changes. That's the real choice here.I think civilization will have problems regardless of the path the climate is on.
But I'll take problems in a world with a lush tropical Colorado over one with an ice age Colorado any day.
By the way, the experts aren't predicting "lush tropical Colorado." They're predicting a drier, deforested Colorado:
http://www.rockymountainclimate.org/website pictures/Hotter and Drier.pdf