Sen. Lindsey Graham (R-SC) announced that he?s running for President on Monday, officially becoming the ninth declared Republican candidate. Of all of them, he?s only one of two who publicly accept the science behind human-caused climate change, while most of the rest are sticking to staunch denial.To be totally clear, the science behind climate change is this: the earth?s atmosphere and oceans are warming, and this is primarily due to human-caused carbon emissions. That warming is going to have harmful effects, including sea level rise and increased risk of extreme weather. The worst impacts of this warming will primarily fall on developing countries, but the U.S. will see harmful impacts as well.Marco Rubio says ?there?s no consensus? on that science. Ted Cruz says people who believe in climate change are like ?flat-Earthers.? Rand Paul has said the idea that humans cause climate change is ?alarmist stuff,? and Ben Carson once said ?We may be cooling.? Carly Fiorina; Mike Huckabee; Rick Santorum ? all have expressed heavy to mild denial of the overwhelming scientific evidence that says humans cause climate change.

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