I've said it before and I'll say it again. I think we'd screw up geoengineering; there will be some miscalculation or unforeseen variable. It's too big a syst

I've said it before and I'll say it again. I think we'd screw up geoengineering; there will be some miscalculation or unforeseen variable. It's too big a system to account for all the details. I think out time would be better spent dealing with what's coming our way and taking our foot off the accelerator than trying to slam on the breaks or put it in reverse.