Via Instapundit, here's an article about an outfit that thinks they've got a process where microorganisms eat sunlight and CO2 and produce ethanol and hydrocarbons as waste products. As observed, the trick is to figure out how to scale up the process, but apparently -- if it does scale! -- you could satisfy the U.S. appetite for liquid fuel with an area the size of the Texas panhandle.
That's a substantial improvement on current techniques. And you can do it in areas where you can't grow food.
I rather dislike burning food.
Which reminds me that it's time to go fire up the grill and put the steaks on. :)