Ethanol is produced from plant matter, and plants get their carbon from the atmosphere. So if we switched entirely to ethanol as fuel, we would not be adding more carbon to the atmosphere, we would be recycling it. And to gradually reduce the total amount of carbon, we need massive reforestation programs that will put carbon back into the ground where we found it in the first place. And yes, I'm aware that ethanol is far more expensive than gasoline. But so what? What is the cost of the extreme weather events that now seem to take place almost every day?