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What will be the best renewable source of energy in 2050?

As of now, we have Wind, Water, Solar, Geothermal, and many more. But as our technology changes and diversifies, do you think we will use completely different sources?

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  • Jul 28 2012: I think we could use people as a resource for power, there is new tech out there where when you walk it is harvesting that pressure and turning it into electricity. Our waste makes some of the best fertilzer and could be used in a much more productive way then polluting our waters.
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      Jul 30 2012: I don't think this qualifies as renewable energy. One might argue that this is simply decreasing wasted energy. Also, from what I understand, the technologies that are currently used to harvest energy from walking perform terribly in a life-cycle analysis. (They also don't harvest much energy unless there is very heavy foot traffic.)

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