I'm not so hopeful about electric cars. The nice version of the Tesla S has an 85kwh battery to accomplish adequate range, and its drivetrain is probably pushin

I'm not so hopeful about electric cars. The nice version of the Tesla S has an 85kwh battery to accomplish adequate range, and its drivetrain is probably pushing 90% efficiency. It really does take 80-100kwh to drive a midsized sedan for 250+ miles. Even a doubling of battery power/weight ratio from now is optimistic. And charging times are tied to that massive storage - a 20kw source (the equivalent of a 200 amp circuit at home) would take over four hours to charge it. And that's, say, 20 amps at 1000 volts - enough to jump a spark a few feet and leave a smoking puddle where your shoes used to be if there's a problem. So faster charging requires specialized charging stations that must be carefully managed, a lead Tesla has taken. And even those stations can only do half-full on power. The battery won't take the abuse of high speed charging all the way. So the car tech is already here. The charging problem, on the other hand, is borderline unsolveable.