I would start with where you use the most of it. The biggest single place where we use natural gas is in heating in residential and commercial applications. A lot of the equipment we're using today is relatively low efficiency compared to what's available in the marketplace, which is over 95% efficient; a lot of equipment is anywhere from 60% to 80%.
Measures--and they're going to be different depending on whether it's commercial or residential, because it's a different tax system--that create incentives to move that equipment to a higher efficiency level.... Some of the things that are in our proposals here go to things like combined heat and power systems, and hybrid systems, where you're marrying natural gas with renewal sources. There I'm proposing an investment tax credit.