Secretary of State John Kerry said Wednesday from Paris that climate change is contributing to the flight of thousands of people from Syria into the eastern edges of Europe.

While most say the refugees are being driven out by Syria's brutal civil war, Kerry was asked in Paris by New York Times columnist Tom Friedman whether climate might also be a factor.

Friedman said he was in northern Syria in 2013, and said people were already being driven out by the "terrible drought" in Syria. Friedman then asked Kerry how much of the refugee crisis is "climate driven."

"Well, there's a percentage, Tom," Kerry replied. "I don't have the ability to tell you sort of the full degree."

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