I'm not sure of the percentage reduction we're going to need to achieve our Kyoto commitments, for example. We have some air quality targets, and I'm not quite sure how they relate to percentage reduction in fuel use. However, there are many examples of how you can do this. You can start by closing some coal-fired power plants. You can start by energy efficiency measures that engage the public. You can increase wind, solar, and hydro power. All of these measures will reduce that.
On February 13th, 2007. See this statement in context.