Just think it through a bit further
This is a very complex question and 'favorite' is a bad word here. There is, doubtless a 'right' solution or several of them in combination, but let's forget about favorites - that is the kind of unrestrained selfishness that got us where we are.
The problem is two-fold. Unless there is an almost immediate change in public attitudes, especially in the US, in another 50 years our children and/or grandchildren will probably have insufficient oil to allow for individual use of cars.
Second, the unrestrained use of fossil fuels *may* result in sufficient warming of the planet to submerge half of any coastal towns and cities - remember that one New Yorkers and San Franciscans. I say 'may' because the jury is still out, IMHO. The question is, are we happy to continue gas guzzling in spite of the worse possibility?
The first thing that occurs to me is that, when confronted with an external threat, one should try to find a way of turning it to our advantage. Several contributors to this discussion have mentioned the inefficiency of electrical conversion. If electricity is generated using fossil fuels, there is little or no benefit in using it as a fuel source.
However, if global warming is a reality, then clearly the earth is accumulating more energy. The trick, therefore, is to use the additional energy and, without burning, convert it to something that can drive the car. Solar power seems to me to be the best option, since the sun will always be there and is accessible over a much greater porportion of the earth's surface than, say, wave or wind power. Moreover, we are turning the problem back on itself.
A car that generate its own hydrogen from solar powered cells covering its roof and ran on sea water would fit the bill.
Now for the important bit. The problem, it seems to me, is not that we are hooked on our cars, but we are hooked on *performance*. An ultra low drag car design and a motor design that limits acceleration to very low levels could still allow fairly high speeds with very little energy input - and that might allow the hydrogen powered car to flourish. Instead of 0 - 60 in ten seconds, we need 0 - 60 in two minutes!
Currently most car design, and particularly the obscene SUVs (may the inventor rot in hell) waves two fingers at our environment.
That attitude has to be reversed. It is time that the drivers of these monstrosities were regarded as pariahs.
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