or EPA to decide that vehicle greenhouse gas (GHG) emissions aren't harmful is iike NASA deciding that the earth isn’t round after all. Over the next year or two, lawyers will be picking over EPA’s detailed legal arguments. Let’s not get mired in the weeds. It’s crazy that this issue is even being raised.In 2007, the Supreme Court told EPA to do two things: (1) consider whether GHGs endanger human health and welfare, and (2) if the answer is yes, regulate vehicle emissions of GHGs. That’s exactly what EPA did. Nothing has changed in the meantime.