Very interesting SixSeas.
Whatever one attempts to use to power an automobile to 55 mph is going to
1. Produce Heat (who cares?)
2. Pollute with some Carbon Dioxide - CO2
....except for Electric or Hydrogen if made w/o burning something.
So the answer to no pollution is -
Nuclear Power (including Fusion if it ever can be developed)
or
Wind / Tidal Power
or
Sunlight
or
Geothermal
Any of the above can recharge a battery or make Hydrogen cleanly.
So all you Environmentalist Nay Sayers, step aside for the power sources listed
above and actually encourage them - make some kind of positive contribution!
Once we populate the Earth to 2 or 3 or 4 times the present numbers, we will
not be able to use "Fossil Fuel" due to Carbon Dioxide levels causing Global Warming.
Unless some totally new technology appears (vacuum energy or...???) to replace
burning carbon compounds, we will not be able to drive automobiles around or
trucks or aircraft in any appreciable numbers, or we will live in a smog filled,
hot and uninhabitable world. The above exceptions notwithstanding.
I wonder what the next 100 years holds for us?
Our children are in for some tough times.
I have faith that we humans will be able to figure it out, though.
"Necessity is the mother of invention."
DoctorBill