If we can scale this appropriately for cars and trucks, maybe they can "poop" out carbon logs on the highway, much like horses used to do. But with much less methane production. If we really got it to work well, maybe they could "poop" out diamonds!
I'm thinking there might be a little Second Law problem though: The process probably takes more energy than you got out of making the CO2 to begin with. I think that's the problem with all industrial carbon sequestration schemes. It would be more efficient to just stop burning fossil fuels. Solar, wind, geothermal, tidal, hydroelectric, and nuclear don't have that problem.
