Certainly the concept of switching to waste-based biofuels is being discussed all over the economy. A lot of the biofuel industry has suffered a bit from there not being a full accounting of the greenhouse gas production. If you plant a crop, harvest it, bring it to a processor, create ethanol, and not count the greenhouse gases in the production—and this is allowed by Kyoto, so I'm not criticizing anyone—the overall environmental footprint is not as positive.
Our biofuels are actually waste based. There's very little greenhouse gas production. You'll see, for example, that the captured burn of methane in the agriculture sector is exactly the same concept. Something that would have come out as waste, and methane of course, does 27 times the damage than carbon dioxide. Something that would have come out instead is being used to displace fossil fuels.
To be fair—and I think this applies to the whole economy—this is hard. Let's not pretend there's a switch you can turn and everyone is green, or you take a boy scout pledge and an economy that's totally dependent on greenhouse gas production becomes independent of that. We're all groping. We're all trying to figure out how to do it. It's easy when we're doing policy debates to make it seem either impossible or very easy, but the truth is that all the sectors are trying to find ways. Sometimes it's easier and sometimes it's harder.