We've already discussed the carbon lobby's amusing - if utterly grim - ad campaign for the "benefits" of CO2 in the atmosphere. With slogans like "Carbon dioxide -- they call it pollution; we call it life" the parody almost writes itself, but it's great to see more creative minds engaging in the counter attack, using funny words and images to fight the cargon lobby's funny science.
One of our old favorites, for the sheer simplicity of the gag is the Onion's headline Ross Ice Shelf Embarks On World Tour.
Have you seen other examples worth calling out?
I was moved to create my own viral marketing campaign to augment the CEI ads.