I would agree with most of the previous speakers. I think that 50-some-odd-year timeframe is right for getting, I would argue, emissions to that 50% or 60%, or whatever percentage we're talking about. Whether that eliminates the use of fossil fuels is another matter—I doubt it—but whether we can manage the carbon emissions is conceivable. We can see most of the technologies from where we sit today. A lot needs to be done to develop them further, to make them more economic, and to actually get them in place.
On November 21st, 2006. See this statement in context.