Aridas
Crazy Little Green Dragon
Well, that's what I'd like to know? How is it going to hurt the US?
Which aspect do you want? Ignoring the climate effects that you don't accept the conclusions of the overwhelming consensus of relevant scientists about, it hurts the US's international relationships, for starters. On the economic home front, it's part of a strategy to try to prop up an inevitably declining industry for a little longer, rather than supporting the very quickly growing and much more sustainable green industries that have primarily and much more broadly benefited rural areas that need the stimulus and jobs the most.