by 
1THING
ANSWERS: 6
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i think solar power
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we will fly ! no cars!
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Hydrogen - after we use our present day knowledge to build an electric grid transportation system for electric cars, some kid still in college will figure out how to use hydrogen and make it work in a small engine. Then we will all be changing over to hydrogen! It's clean!
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IF HUMANS SURVIVE.==GAS, DIESEL AND PERPETUAL MOTION.
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There are many, many possiblities, but I would bet on green gasoline made from algae. I think that it will become popular because algae farms can 'eat' the carbon-dioxide from power plants and then extract oils from it to make fuel.
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Human urine. I read an article somewhere, which stated that human urine was being tested as an alternative fuel for automobiles. Can't you just see driving around the corner, hiding and filling up your tank? A person would have to drink a heck of a lot of water to keep his engine going.
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