Politifact on Sanders’ claim that global warming caused ISIS — ‘MOSTLY FALSE’
Our ruling: Sanders said, "Climate change is directly related to the growth of terrorism." - We couldn’t find any evidence of a "direct" relationship between climate change and terrorism, though many reports have noted an indirect link. There are, of course, many other factors that contribute to terrorism, including religious and ethnic tensions and political repression. We rate Sanders' claim Mostly False.