On Mon, 21 Jan 2008 15:09:47 -0700, Shawn
wrote:

Doug Hoffman wrote:
snip

... data does not support much if any net
improvement in CO2 emissions relative to gasoline.

a part of the CO2 produced by the engine, proportional to the ethanol
grade in the fuel, comes from the atmosphere, and there it returns. No
net increase in CO2 mass in the air.
Fossil fuels actually release CO2 in the atmosphere instead,
increasing the total mass of CO2 in the air. This is the point.

Then, we might argue against biofuels, that crop prices are
increasing, and that's not good for the consumers, especially for
those who live in poverty.

Aldo Cernezzi