Thanks, that does sound like a good candidate. My expectation after reading the Atlantic article is that I'll largely agree that it is cost-effective legislation. But I have had such positive expectations dashed before. It's a bit suspect that the source for this good news is the EPA itself. We all know what to think about research performed by Philip Morris. I also note that the act is a factor in the addition of ethanol to gasoline, which I think is bad policy overall. I have doubts that the EPA counts such secondary effects as "costs." It's not an easy calculation.The Clean Air Act requires the addition of oxygenates to reduce carbon monoxide emissions in the United States. The additive MTBE is currently being phased out due to ground water contamination, hence ethanol becomes an attractive alternative additive.