He claims that if we just covered all of the farm land that's used to grow corn for ethanol with solar panels, we would produce more electricity than the entire country consumes. What he neglects to look into are the externalities. 1) Most of that corn is used to feed livestock which we eat. Solar panels don't feed livestock. 2) The corn needs some fertilizer, but that's pretty much it. We have to manufacture solar panels. 3) We have to dispose of solar panels, we can't just feed them to cattle. 4) You can't transmit that electricity to the cities that need it from farmland in the midwest without hundreds of billions of dollars in investment, huge line loss, and the need for batteries that don't currently exist economically at scale. Factor in all of that next time. Yeah, ethanol is stupid when petroleum is plentiful, but keep your math honest at least.