I'd like to add, if I may, that we would like to see more attention given to this. As Chris pointed out earlier, urban energy use in general is about 60% of our emissions. It's a large chunk. To get at that, and not in an individual sense of how efficient a building is or how efficient a furnace is, but in this integrated aspect, the amount of effort and attention we give to it should be commensurate with the size of the solution it offers.
On March 31st, 2009. See this statement in context.