Climate change is real, case closed. But there's still a lot we don't understand about it -- and the more we know, the better chance we have to slow it down. One still-unknown factor: How might clouds play a part? They're critical in regulating earth's temperature, and there's a small hope that they could buy us some time to fix things. Climate scientist Kate Marvel takes us through the science of clouds and what it might take for the earth to break its own fever.