If Bernie Sanders can be criticized for his comments about terrorism at Saturday’s second Democratic presidential debate, it’s not because he linked terrorism to climate change. It was his opening statement with a few sentences about the attacks on Paris, which were crowded clumsily into a preface of his standard speech about economics. Even avid Sanders supporters like me winced at that. But there were, as The Hill reported, lots of raised eyebrows later when Sanders repeated in the second debate what he said the first debate about climate change being the greatest threat to national security—raised eyebrows and mockery.