Last year I debated a libertarian about the EPA. I didn't even have to make my case! As you can see in the somewhat long discussion thread over at Busta's site, there just wasn't much I needed to do. My opponent made all kinds of verifiably false claims. The thing with the light bulbs. I knew the light bulbs were going to come up and I was prepared for it!
http://bustatroll.com/debates/121-the-epa-debate