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diesel/petrol, it still has the same source - and like it or not, it will run out (after it gets too expensive, of course). this is the time that should be spent on designing viable alternatives, instead of burying ones heads in the sand and hoping it'll go away.
significantly reducing air travel would likely extend the life of the diesel/petrol car, because i cannot see any sensible replacement for powering jet/prop aircraft. roll on Zeppelins into our future - slow, maybe.
now is the ideal time to invest for the future....
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