One question I have about the 'Paris Accords' is what the estimated cost is to the US, and how proportionate this is in relationship to the other nations involved.  It appears to me that China's commitment is pretty weak, saying that they will cap emissions beginning 2030.  I am concerned about global warming and GHGs, but do not want to see the US spending a large amount of money on ambiguous and ineffective projects and programs.  Trump is correct in saying that this will weaken any competitive advantage that the US may still have.