With rising oil-prices, and the end of reserves near, a lot of substitutes have been developed? But which one of these are actually guaranteed to be economically viable? What will run our cars and jets 50 years from now? How much would it affect the global economy? Is there a possible problem in the future? Is there a possibility of a global energy crisis where people will have to conserve like crazy, or is there enough respite in sight that we shall be able to live like we're living? What technological breakthroughs have been achieved and what is the likelihood of them being adopted?
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