It's obviously tricky to convert cellulose to a useful biofuel. I think actually the most efficient way to use cellulose is to burn it in a co-generation power plant. That will yield the most energy and that is something you can do today.
Elon MuskYou need to be in the position where it is the cost of the fuel that actually matters and not the cost of building the rocket in the first place.
Elon MuskThere's a tremendous bias against taking risks. Everyone is trying to optimize their ass-covering.
Elon Musk