Reality check: Climate change

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The promises of candidates during political campaigns are often made to be broken, but they do provide clues for voters who want to know what government might look like once the election is over.  Hillary Clinton describes global warming as an "urgent threat."  Donald Trump once called it "a hoax created by the Chinese." He's tried to back off a bit, but their differences are still profound, with dramatic consequences for energy policy and the environment. Clinton says she'll increase reductions in fossil fuel and build on the Obama legacy — which Trump promises to obliterate while he restores the coal industry. We hear the implications for the Paris climate accords — just approved by the European Union — and for national security.