There is wonderful news just out. That Gliocladium roseum, a fungus from the Patagonian rainforest, eats cellulose and excretes the same mix of compounds as diesel fuel. You can read the actual paper here. That's right. Take any cellulose source you want. Lawn cuttings. Old mattresses. Used underwear. Chop them up. Add water. Add fungus. Out comes diesel fuel.