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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 29 2012: I read about the positrons and anti matter and the equal amount of energy they generate compared to a nuclear reactor without any hazards , so I feel that should be the future sources of renewable energy
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      Jul 30 2012: Could you elaborate on this? I am not familiar with any way of using positrons and anti-matter to generate useful energy. The positrons and anti-matter would have to be "harvested" so to speak, not generated by humans, in order to be useful for energy production. What are your sources on this matter?

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