brtlmj wrote:
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.

Strictly speaking, CO2 released by burning fossil fuels comes from the
atmosphere, too. It has just been buried underground for a very long
time ;-)

....but it would be nice to keep as much as possible of it down there.


--
martin@ | Martin Gregorie
gregorie. | Essex, UK
org |