Ethanol wouldn't work because, it usually has a <1 EROI, and requires way too much land. Hydrogen might work as way for storing energy; I don't think there are

Ethanol wouldn't work because, it usually has a <1 EROI, and requires way too much land. Hydrogen might work as way for storing energy; I don't think there are limits on producing Hydrogen, given the energy. I don't know if the Tech is mature enough. Oil is doomed to run out someday (possibly within this century).