<human>: I've been hearing a lot about a new type of fuel that is made from corn. I'd like to learn more about it.
<bot>: Corn-based ethanol has been around for a while now, and there are many different types. It's produced by fermenting the sugars in corn into ethanol, which is then blended with gasoline. Ethanol is a renewable fuel source that reduces greenhouse gas emissions compared to petroleum-based fuels.