First of all, A BS is more education than Sean Hannity ever got, because Sean Hannity is a college dropout, and if Hannity had ever gotten a degree, it would've been in broadcasting, which is one of many ways to get through school while learning fuck-all about the world. Secondly, the point of having Bill Nye on to explain climate change is that Bill Nye explains science to children, which is apparently what we have to do to get the message across to the willfully ignorant trogs of the right wing, if indeed anything will work, which is doubtful.
This isn't desperation, it's shaming. Hannity sees it as a political thing and has completely ignored most all the reputable scientists. Apparently he requires a children's teacher to explain the scientific method to him.
Normally I'd agree...this about sums up what I see a lot of:
http://answers.yahoo.com/question/index?qid=20091202132803AATD I3U
But in this case the guy is clearly more qualified to speak on the subject than, say, Anthony Watts, who is a meteorologist (not a researcher but a weatherman, but even so).