Call me skeptical. Hydrocarbon fuels have a lot of energy in the chemical bonds. That's why they are good as fuel! Making hydrocarbons from CO2 will require hy

Call me skeptical. Hydrocarbon fuels have a lot of energy in the chemical bonds. That's why they are good as fuel! Making hydrocarbons from CO2 will require hydrogen and energy. Where does that energy come from? Maybe solar, or wind, which would actually be a good use assuming this process can stop and start as sun/wind is available, but the amount of solar panels or windmills needed to replace current amount of energy sourced from petroleum would seem to me to be staggering (I haven't done the math).