Do you remember when citizen Trump once tweeted that climate change was a hoax for the benefit of China? It sounded crazy to most of the world. Then we learned that the centerpiece of politics around climate change—the Paris climate accord—was hugely expensive for the United States and almost entirely useless for lowering temperatures. (Experts agree on both points now.) The accord was a good deal for China, in the sense that it would impede its biggest business rival, the United States, while costing China nothing for years. You could say Trump was wrong to call climate change a hoax. But in
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