Will more efficient energy use just make us want to use more?Photo: Vicky van SantenCross-posted from Cool Green Science. I recently had the chance to participate in a panel about energy efficiency at the Aspen Ideas Festival in Colorado. I expected the usual discussion of all the opportunities we're missing to be more energy efficient and save money in the process -- what Amory Lovins calls the "free lunch ... you're paid to eat." Instead, I found myself vehemently defending the very idea of energy efficiency against an idea with the odd name of Jevons paradox, which is undergoing a …