What happens in Syria, for example, there's some thought about this. When you have drought, when people can't grow their crops, they're going to migrate into cities and when people migrate into cities and when they don't have jobs, there's going to be a lot more instability, a lot more unemployment and people will be subject to the types of propaganda that Al Qaeda and ISIS are using right now and so where you have discontent you have instability, that's where problems arise and certainly without a doubt, a climate change will lead to that.

"Bernie Sanders doubles down on link between climate change and terrorism", CBS News (15 November 2015), when asked how drought connect with ISIS attacks in Paris.