I’m very pro-nuclear power.
As for the nuclear waste, the waste that lasts hundreds of thousands to millions of years isn’t any big problem. That radioactivity was already there in the original isotopes. It’s the waste that only lasts a few years to a few decades that will kill you if mishandled. (There is an inverse relationship between the intensity of radioactive emission and the half life of the material).
That said, even that waste is easy to deal with as industrial waste goes. You put it in a water-proof armored container, and put it in the ground. I’m serious. This is really a very practical solution to the problem, even in the long term, despite the fact that it makes us squeamish. The quanitity of waste produced (in terms of both volume and mass) is ridiculously small compared to, say, the sulfur and acid produced by burning coal. Thousands of years worth of waste can plausibly be stored at a single well constructed site, such as a salt dome, or what they’re trying to do with Yucca mountain.
As to worrying about what might happen to it hundreds of thousands of years from now - all we have to do is maintain the containers. Pull them out every 500 years or so and re-laminate over the rust spots.
Another, perhaps less politically correct solution would be to powder it and throw it all over the pacific ocean, where it will dissolve into parts per hundred quadrillion- concentration - far too small to cause any trouble except in our overactive imaginations.
As to how to use it in a car - you could possibly do one of the following
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Using hundreds to thousands of new reactors set up around the country, run artificial fuel factories to generate artificial fuel substances to burn in the engine: Coal gassification, boron-hydrides, other hydrides, perhaps pure hydrogen, provided you can keep the vehicle from exploding violently when the refridgeration system fails.
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Use that power to recharge some sort of advanced battery (though I wonder if they’ll ever quite measure up to good old combustion.
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Use a small nuclear reactor to run a gas turbine onboard the car. No fuel requirements after purchase, no flammable or poisonous materials. All you’d have to do is make sure you get a few meters away from auto accidents until the peices can be picked up by qualified professionals. And don’t check under the hood without proper protective gear. This one has some problems with it, but from a pure engineering standpoint would probably be relatively easy to pull off.
The energy problem is the one environmental problem that I think we really need to pay close attention to. It is real - oil will only last us another 70-100 years. (2020 is ridiculous, we still have another 40 years of proven reserves left, not counting new reserves and alternative oil deposites such as shale oil). But it will run out. And we do have to have something more permanent and substantial. Provided that abundant non-chemically based energy is available, closing any other recycling loop as necessary only becomes a function of throwing enough energy at the problem.
I would reccommend hiring the big eeeeevil energy and engine companies to help out in developing alternative fuel cycle schemes. Why? Because they have armies of engineers who intimately understand the technology of engines and fuel cycles, rather than a few government pipe-dreamers in a think tank. They have the factories and infastructure to act on any new plan and put it into full scale production. They probably intimately understand the oil situation, and have an actual numerical perspective on the issue, rather than the chicken-little/political football perspective that most politicians understand. Finally - they’re energy companies - they exist to produce energy. Any newer better source of energy (ie, one that will actually work!) that they can put into play would allow them to dominate their competitors and earn tremendous profits. This conspiracy theory that they somehow want oil to run out to raise the price is baloney - it’s simply bad economics. The price of oil is mostly determined by the extremely inelastic demand, not the competitive supply. Furthermore, in a competitive economy, no one company can control the prices by withholding supply. They’ll simply get owned in short order by their competitors. The objective of any company in a competitive economy is to sell the most of something that they possibly can right up until the point where the price of demand would preclude making any profit.