In terms of the other sectors, that is to say the other 50%, it really comes from three areas: one, transportation; two, buildings and appliances—I put that together—and the third, which isn't mentioned here, is agriculture, forestry, and urban waste, the bio sector. Realistically, of those three sectors, understanding that particularly in the third sector the source of the emission isn't always energy but has to do with nitrous oxide or methane or something else, other kinds of greenhouse gases, do the three of you think it is possible, without going crazy, to achieve that kind of efficiency in the other three sectors: transportation, the built environment with appliances, and the bio sector? Where are we going to have the toughest part by 2020?
On February 4th, 2008. See this statement in context.