"The years to 2020 will be crucial in determining if the worst effects of climate change can be avoided. American leadership on this urgent challenge is needed now more than ever," she wrote in an op-ed for Newsweek.
But even without the Trump administration's involvement, "the great cities of the world...remain resolutely committed to doing what needs to be done to implement the Paris Agreement," wrote Hidalgo
And, like clockwork, after Trump announced the pull-out from the pact, dozens of mayors of U.S. cities published an open letter vowing to "adopt, honor, and uphold the commitments to the goals enshrined in the Paris Agreement."
The letter initially had 61 signatories but an updated version published late Thursday added another 21. The 82 leaders of cities from Seattle to New York to Fayetteville, Arkansas say they represent 39 million Americans.
