Ethanol issues
Here.
One part of this has me stumped:
Congress said any fuel produced in plants built after 2007 must emit 20 percent less in greenhouse gases than gasoline if it comes from corn, and 60 percent less if from cellulosic crops.
I understood that the appeal of biofuels was not that they emitted less CO2 (as everything does when burned), but that biofuels emitted carbon that was part of the ongoing short-term carbon cycle (plants) instead of new carbon from long-buried fossil fuels. Why should it have to be forced to emit less of it on some arbitrary scale?