In this Feb. 21, 2017 photo, a woman wearing a mask walks to a subway station during the evening rush hour in Beijing. President Donald Trump said the United States “will continue to be the cleanest and most environmentally friendly country on Earth” as he announced pulling out of an international accord designed to curb climate change. But facts muddy that claim. Data show the U.S. is among the dirtiest countries when it comes to heat-trapping carbon pollution. One nation that has cleaner air in nearly every way is Sweden. (AP Photo/Andy Wong)
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