> biofuels are even more inefficient, and therefore a dead end Only if energy density doesn't matter. But it really does, though. Battery powered electric truc

> biofuels are even more inefficient, and therefore a dead end Only if energy density doesn't matter. But it really does, though. Battery powered electric trucking? Dead end. Battery powered aviation? Dead end. Battery powered shipping? Dead end. [edit] Maybe there's some sustainable way to convert solar energy into sufficiently energy dense fuels that isn't biological, but so far it seems like seed oils or algae are probably the least bad?