Yes because the UN is the friggin paragon of passing policies that work well.
So its better to have policies that aren't expected to work but are expected to cost a lot. Great plan.
I think I'll just spell it out for you.
Don't need that, but thanks anyway. Sure, the models vary. And no, it isn't any more certain what the exact cost will be than what the exact effects or warming will be as a result of human activity (or without, for that matter). The point is, I have yet to come across any convincing model that it won't be extremely expensive. And, importantly, there is no model of the effects which makes it anything other than worthless.