His argument basically seems to boil down to: "it's hard and there's only so much americans can do, so we shouldn't worry about it".
Global warming could theoretically cause the extinction of humanity. Not saying it's likely or anything, but it's one of the few threats that we know of that could do it.
It seems like the type of issue where it's ok to possibly "waste" some resources in trying to solve the problem. To make a terrible poker analogy, I wouldn't mind throwing some chips at the problem to avoid going broke, even if it only reduces the go-broke % by a small amount.
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If serious warming happens, we can adjust, as we've adjusted to big changes throughout history.
This is a pretty big assumption, IMO. Lots of scientists have said that the problem will be far harder to deal with the worse it gets.