The idea behind ethanol is that it reduces carbon dioxide (CO2) emissions and, in doing so, it saves the Earth from global warming/climate change, but CO2 plays no role in climate change, and shows up well after any increase or decrease of temperatures. Ethanol is bad science. It is bad for the engines of cars that must use such a gasoline blend. It increases the cost of gasoline and all other corn-based products. It actually increases the amount of CO2 in the atmosphere. And it reduces the mileage a car can achieve with pure gasoline.Read more at Warning Signs.