From aluminium, which for which the primary inputs are electricity and ore and a binder. There are numerous possible binders and many are not petrochemicals.
right the ingredients still rely one way or other on dinosaur juice. you made it sound as if NASA was able to produce their own fuel out of thin air and test beakers.
edit: my point was that the solid fuel still relies on oil dug out of the ground. parent seemed to suggest that wasn't the case.
