First on climate, this is simply a bad "deal" for a number of reasons most prominently that it "commits" the US to a high cost / low return program that secures neither US national interest or global climate interests. Secondly, apart from the voluntary nature of goals and the modest commitments by the biggest polluters; this was never even a treaty under US law (Obama never submitted it to the Senate where it would have died) - again, Obama was brilliant with putting sentiment over substance. 

You can go into all the very rational and comprehensive arguments why the treaty will not work and simply does not make sense from a risk perspective. Of course, much of the argument on the other side rests on catastrophic predictions (with a terrible track record), moral imperatives and virtue signaling mostly shared by the Davos elite. Don't get me wrong, ensuring a cleaner environment is a good thing - much is already happening without the treaty and will continue to happen without a treaty.