We've done it partly--and I don't claim any great virtue for this--because we were managing a transition anyway. We had been a very heavily coal-dependent economy and we were moving towards using more gas as a fuel because we were getting gas from the North Sea. We were able to convert to gas. We've also had some reduction in our manufacturing sector, so to some extent we have exported our problem with emissions to countries from which we're now importing goods.
So partly it has been happening anyway as a result of structural change in our economy, but I would say that it has also been driven because government policy has tried to move further and faster through the sorts of mechanisms I've described.