Remember climate change? For the first time since 1984, the issue didn’t even come up in a presidential debate. But bringing climate change back into our national conversation is as much a communications challenge as it is a scientific one. Scientist Anthony Leiserowitz, director of the Yale Project on Climate Change Communication, joins Bill to describe his efforts to do what even Hurricane Sandy couldn’t — galvanize communities over what’s arguably the greatest single threat facing humanity. Leiserowitz, who specializes in the psychology of risk perception, knows better than anyone if people are willing to change their behavior to make a difference.