Editorial: Mr. Trump, Alone With His Lies in a Warming World

As Syria approves the Paris climate pact, the world should ignore the last holdout and achieve the goals it set.

President Trump is about to be a party of one.Earlier this week, Syria announced during an international conference in Bonn, Germany, that it would add its name to the historic 2015 Paris climate agreement, in which nearly 200 countries pledged their best efforts to reduce greenhouse gas emissions. This would leave the United States as the only country to have rejected the Paris deal, which Mr. Trump did in a Rose Garden rant on June 1 that was notable, even by Trumpian standards, for its dis...