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What Trump can do is remind his supporters—and everyone else on the planet—which side he’s on, and, more to the point, which side he’s fighting. He’s taking a shirts-and-skins stand against liberals, against goo-goos, against condescending scolds in Birkenstocks who don’t like Styrofoam or hulking SUVs or real Americans, against naïve globalists who want the U.S. to suck up to the French and the Chinese and the United Nations. Climate change will affect the entire earth, from drought-ravaged farm villages in Africa to floodprone condo towers in Miami, but for Trump it’s just a symbol of the stuff that people who don’t like Trump care about. Paris is just an Obama legacy that he can kill, when he doesn’t have the votes to kill Obama’s health reforms or Wall Street regulations or tax hikes on the wealthy. Whatever damage Trump’s climate policies cause to the planet will be collateral damage, shrapnel from his political war on elites and the left and Obama.
But that won’t make the damage any less real. The United States happens to be located on that planet, and it’s the only known planet with pizza, whether the president wants to protect it or not. The United States is also part of the community of nations, and it’s a community with many common interests, whether the president wants to lead it or not.