There is a 'cost' to doing nothing too. When you complain about the costs of fighting climate change, don't forget the cost of doing nothing, in terms of ever-increasing weather related insurance and repair bills, increased health care costs as tropical diseases move north, things like that. Cost of all those flooded beach houses. Cost of moving the population of Bangladesh, Netherlands, Florida, Now Orleans, Nauru, etc. to higher ground (you think carving Israel out of Palestine was destabilizing to global peace and prosperity, just wait till they have to carve a new Bangladesh out of India.)