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Republicans join Dems backing a military study on climate-change threats - Business Insider Menu Icon

In January, Mattis described global warming as a driver of instability requiring a broader, whole-of-government response. Thomson Reuters President Trump has been highly dismissive of the long-term threat of climate change, to the point of recently pulling the U.S. out of the Paris international climate change accord. But not so Defense Secretary James "Mad Dog" Mattis and many other defense experts.