Just before others answer, I'm interested in other answers, but you can understand the dilemma that's in front of us, which is that certainly one wouldn't say that we should develop infrastructure for all of the emerging technologies, so how do we deal with that? It becomes extremely problematic, because if the answer is in the fuels, as is being told to us right now, then what fuels are we betting on and what infrastructure are we trying to get? We can't have ethanol offered at every gas station, biodiesel at every station, and hydrogen at every station. To some extent, we have to choose, and that's the dilemma. How do we get around that if it is in fact the reality that fuel is going to be a big or principal driver of these improvements?
On February 6th, 2007. See this statement in context.