This isn't going to be pretty. Just as the oil industry uses FUD to create false "uncertainties" about climate science, Ken Ham misrepresents evolutionary science to make it appear that there is a debate. There is no way for a logical person like Nye (who is a mechanical engineer by training, BTW) to effectively counteract Ham's bullshit.
The very fact that this debate is happening is already a win for Ham (and not just because of the millions of dollars that AIG is raking in): The amount of media coverage that this "debate" has received creates the impression that there is a debate to be had - when the basic science is very well-understood and unambiguous. Ham's work is FUD at its finest.