One note, your second claim is not entirely true - while land vehicles are a ways from being feasible to power with photovoltaics (although I would have to do t

One note, your second claim is not entirely true - while land vehicles are a ways from being feasible to power with photovoltaics (although I would have to do the math for trains, which may be close), we already have primarily [1] and exclusively [2] solar-powered aircraft. [1] https://en.wikipedia.org/wiki/Solar_Impulse#Solar_Impulse_2_.28HB-SIB.29 https://en.wikipedia.org/wiki/Solar_Impulse#Solar_Impulse_2_... [2] https://en.wikipedia.org/wiki/Helios_Prototype https://en.wikipedia.org/wiki/Helios_Prototype