The problem is that, as a modeller, I believe it's very hard to confirm that the emissions rate has really been changed in other countries. You can subsidize this or that gas-fired station, but you can never be sure a gas-fired station has been built, and not a coal-fired power station. It's hard to know for sure if the emissions trend has really been changed.
On November 9th, 2006. See this statement in context.