Prince Charles says he has been talking about climate change at global conventions and conferences for 20 years. But Twitter just caught on. After previews of an interview he gave recently were released Monday, Charles trended on Twitter for hours. That was because of his theory that the migration out of Syria is because of drought. In the interview, Prince Charles said he believes that climate change led to conflict between hundreds of thousands of people. And that led to the war. Prince Charles is going to be in Paris next week for a United Nations conference on climate change.