To adequately address climate change concerns, we will need to radically alter our energy systems to eliminate practically all carbon dioxide emissions. In analyzing the different technology options, the important measure of comparison is how much emissions reductions can be achieved and at what price. Unfortunately, the debate usually moves from objective analysis to emotional arguments that can obscure the facts and stall progress toward the ultimate goal of eliminating carbon dioxide emissions. The truth is that all energy technologies have strengths and weaknesses. We need to build on their strengths and to minimize their weaknesses.