I'm going to say that the key thing is not necessarily the path by which you get it, but the path you end up at. As has been mentioned by Dr. Stone, over the next couple of decades, regardless of which policy path we take, we'll have a certain degree of warming in store of about 0.2 degrees per decade. What really matters is where we want to end up. That is why any decision must lead to cuts on the order of 60% to 90% reductions by the middle part of this century in order for us to stabilize at acceptable levels of greenhouse gases.
So it is important to have it, but it's not necessary to say that the reduction must come tomorrow, the next day, or the day after. It's important that we reach a target that's realistic and lasts more than one or two political cycles and that will set the stage for major, dramatic reductions in emissions.