In the long run, converting non-oil based forms of energy in to bio-fuels *may* be the most efficient way to run transportation networks. Research and development in these areas, although not currently economically sensible, is a valid and useful hedge against the future - after all, you probably won't be able to put a fusion generator in every new car model of the 2030 (or whatever) season, so putting hydrogen or canola diesel or gigawatts of electricity into your car may be the way to go.
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