We would offer that energy in general should be used more efficiently and through less polluting technologies, and that's where some of what we've outlined today comes into play. So the opportunity in the near term for reducing greenhouse gases and pollutants is likely greatest just by energy efficiency alone.
The Pew Center on Global Climate Change in Washington is on record stating that, and clearly we have an opportunity to start diversifying--even things like our pipeline grids--with more renewable content. It's not all that dissimilar from renewable content in gasoline.