Tucker Carlson stumps Bill Nye over climate change

Sounds like Bill Nye can't give a straight answer about Tucker's question. Bill says human activity causes climate change and it's a settled point, but Bill can't tell you how much is caused by humans. It could literally be 1%, but Bill doesn't know. He starts talking about the ocean. Without human activity, how long would it have taken? Bill doesn't have the "settled" answer he said he had.