G20 summit shows Trump took U.S. from first to worst on climate change in under a year

At the 2016 G-20 summit, in Hangzhou, China, world leaders united in a common determination to implement the Paris Climate Agreement before the end of the year.  The U.S., led by then-President Barack Obama, was a key player in rounding up support for the agreement. It was difficult to imagine then that the U.S. would ever turn away from this agreement, widely regarded as the world's last, best chance to rein in global warming, that it had worked so hard to forge. Then President Donald Trum