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.
