The Climate Change Elevator Pitch

So you're in an elevator, or at a party, or eating dinner with relatives, and someone says, "I don't get what's the big deal about climate change. What's going on?" What do you say? That depends on who you are and what you know. What if you're a climate scientist and you know a lot about this issue? How do you respond? The great website Climate Denial Crock of the Week is putting together a series of videos asking climate scientists just this. What's their "elevator pitch"? The first video has j...