I would come back to something that Gordon Lambert said earlier, which is that what we need to do here to move toward deep reductions in emissions is to mobilize private capital to achieve a transformation in the economy. To do that, we need to set regulated requirements to reduce emissions to a sufficiently stringent level that the price on emissions drives a major change in investment decisions. That must be the test for whatever it is that is included in the Clean Air Act or in the government's broader climate change plan.
On February 20th, 2007. See this statement in context.