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Ethanol has proven to be less fuel efficient (more power for the buck) than gasoline. It actually reduces your MPG when you mix 10% of Ethanol by volume with gasoline! In terms of energy density (the amount of energy you get out of it) gasoline's energy density is 60% more than Ethanol. Diesel is about 80% more than Ethanol. Natural gas has about 18% more energy density than Ethanol. Cars with ethanol mixed gasoline will require you to pay more money just to get the same MPG if you use just only gasoline. And requires you to buy more of the mixed gasoline in greater volume, too.
Brazil's ethanol comes from sugar cane which is a food crop, also. Not smart. Secondly, not all of Brazil's car run soley on Ethanol but a mix of 25% Ethanol and 75% gasoline. You still need petroleum based gasoline to run the cars and the population continues to grow which means more gasoline is needed.
And before you hold Brazil's sugar cane ethanol as the holy grail of gasoline you might want to read this about how slave labor is used to get the sugar cane to make the "gasoline" for Brazil's vehicles.
A 'Green Tsunami' in Brazil: The High Price of Clean, Cheap Ethanol - SPIEGEL ONLINE - News - International
And you thought that oil was bad?
Oil is big impact on environment, of course.
Ethanol is more cleaner and less emission than gasoline, I do know about less MPG but only lose about 2-3 MPG, it's not much difference.
Oil shale isn't give everything what US need and US still has low oil reserves when compare to middle east, you are just support oil companies to lobbies like many conservative people does. Drilling oil wouldn't solve the problem because you still have buy oil for market price. Oil shale does work when oil price is higher and projection on 1.5 trillions aren't officially accurate, maybe much less.
I don't agree with you about global warming but not right thread to debate and it has already done.