Ethanol is genuinely renewable. It is reliable contrary to wind and solar. Its large energy density makes it good for transportation fuel.
Producing ethanol from corn was thought to be a starting step before better methods appear. Subsidies changed the story and went to prices. The drawback of the biofuels is inefficiency. Large amount of land and other resources are required.
CO2 is a non-issue. Let’s talk about price and domestic availability.