There are philosophical issues involved in that about choosing the right discount rate, the value, the future, and things like that which drive it. But its start with the premise that global warming is real and if you're a denier of that fact, then you're not going to find climate change mitigation
“I've been working in Haiti 28 years - I thought I'd sort of seen it... I've gone through a number of coups, the storms of 2008, I thought, you know, that I'd seen things as bad as they were going to get, and I was wrong.”