“I mean, we’re talking about, according to the CIA, future, major national security issues when people are forced to migrate because their countries or their land are flooded, they can’t grow food,” Sanders said at a rally in Keene, N.H., on Saturday. “We’re talking about a major, major crisis.”

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The Vermont senator said there is no longer any debate among scientists on what causes climate change and what its consequences will be.

“The debate is over. Climate change is real, it is caused by human activity, and it is already causing profound disturbances all over America and all over the world,” he said.

Sanders slammed the Republican Party for “rejecting science” on the issue of climate change.

“Somehow on this issue of climate change, an entire, major political party is rejecting science, and that is a very dangerous thing to do,” he said.

He accused Republicans of being beholden to special interests in the fossil fuel lobby.

Sanders’ remarks come amid the COP21 climate change talks in Paris, which President Obama attended earlier this week.