Well, the newer numbers that we achieved, and factoring in the regulations.... We know, for example, that the tailpipe emissions will achieve a reduction of a significant amount of megatonnage because fully a quarter of Canada's greenhouse gas emissions are in the transportation sector. We know that those regulations and the science behind them will get down a certain number of tonnes. We know that the new regulations for coal-fired electricity generation, by achieving new operating performance standards, will reduce the megatonnage from that sector. As we regulate each sector, we can anticipate where we'll be in 2020.
