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Yep. We should be able to make enough renewably to fill a few rockets, just not likely or desirable for the entire world's car fleet.
What you see coming out the back above is water.
This rocket family could scale up to a serious zero emissions* space exploration capability immediately. They could get to the 7 core version relatively easily. Why NASA wanted to go down the route of spending billions developing the new Ares V I don't know. Keeping ATK in business I think. It's fairly safe to say that this would have flown by now had Bush chosen this route in 2004.
By the way, SpaceX made the decision to develop RP-1 (fossil fuel) based technology because it is cheaper and easier for a start-up. I fully understand that and hope it enables them to break into the market, but I hope they make a switch to H2 some day. Or perhaps Elon just hates hydrogen that much :smile:
In the medium term we can use renewable fuels (H2 from electrolysis or liquid biofuels). In the long long term electric launch will dominate (some combination of linear accelerators, spinning tethers or space elevators).
More efficient than what? One bigger motor? No - two smaller motors returning same power have more resistance losses than one bigger motor.
That is also the biggest difference - bigger motor has bigger wires that "offer" less Ohm-resistance and are thus more "heat resistant".
It can output longer/higher high-power bursts because it has higher thermal capacity.
On the other hand this "bigger motor" compared to classic ICE is still minuscule. There is no real gain in making it smaller.
The only real problem in electric motor is cooling. You want more power/torque? Just raise the voltage and thus pump more current through it. It will get hotter so you have to cool it (better).
Smaller the motor, smaller the wires, faster the temperature will rise.
That makes just to enough sense to sound realistic until you think for a minute and look at the other "articles", though it would probably be a more constructive use of Scientology funds.