If you were watching CNN the other day you saw thousands of people marching in Washington calling for action to counter climate change. During the Presidents Inaugural and State of the Union addresses, he did not shy away from this controversial subject. So what's all the fuss about? We thought we'd find out what Bill Nye 'The Science Guy' has to say and what opponents have to say about the subject.

Here we have Bill Nye narrating a short film on the basics of climate change.

And now a spirited debate featuring two separate sets of facts.