We don’t know what climate change will cost — that doesn’t mean we can ignore it

From TheHill.com:

We don't know what climate change will cost — that doesn't mean we can ignore it

http://thehill.com/opinion/energy-environment/386952-we-dont-know-what-climate-change-will-cost-that-doesnt-mean-we-can?#.WvcdbOuR57c.twitter