Republicans are increasingly concerned that President Trump's threat to build a border wall by declaring a national emergency might be repeated by a future president who sees climate change as an existential danger to the United States.
"The reason we care about the changing climate is because it is a threat multiplier," said Katharine Hayhoe, an atmospheric scientist and a political science professor at Texas Tech University. "If you think immigration is a problem now, just wait. If you think international competitiveness, or agriculture or water shortages, or the extreme amount of money that is being spent to help cities and regions recover after disasters, if you think any of that is a problem right now, just wait."
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