Should you be worried about climate change? The answer used to be debatable — literally.

Way back in 2007, NPR aired a debate over the proposition that “ Global Warming Is Not a Crisis .” The panel had six commentators, divided equally into two sides. Those on the “not a crisis” side (which included Jurassic Park author and nonscientist Michael Crichton) argued that much of the current alarm was based on “ignorance.” Sure, the climate was changing, but that wasn’t anything new, they said. They weren’t convinced carbon dioxide was driving it this time around, either.

Those stuck arguing that global warming was not not a crisis — an awkward double negative — countered that the scientific community was in near-universal agreement that CO2 and other greenhouse gas emissions were at fau

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