> CO2-caused global warming.

Ethanol is said to be carbon-neutral, unlike fossil fuels, which
use historic carbon, so in that respect ethanol is not a long-term
contributor. The point of the research was about pollution

One fuel I hadn't heard about before looking at ethanol and
other bio-mass fuels was anhydrous ammonia

http://en.wikipedia.org/wiki/Ammonia#Fuel

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