by 
bootlace
ANSWERS: 8
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I'd like to say Cold Fusion or Hydrogen but I doubt people will turn to it because they are too concerned with their 'saftey' as opposed to the bigger picture...
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I feel solar energy is by far most untapped source. As the technology improves, this unlimited source will be used more extensively.
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It would be nice to think that we may have cracked how to produce a sustainable fusion reaction. Unlike our present fission recors, which require heavy elements that get split to produce energy (I'm not doing the science bit), and result in bad things like radioactivity, fusion reactions take very light elements and bombard them together to make them join, releasing even more energy and no horrible side-effects. The only problem is that you need them to be very hot to make the whole thing work, and you need very strong magnets. If we could conquer how to do this then our power would be extremely clean and cheap, and wouldn't blight the landscape like windfarms or wave snakes.
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I would like to think we will have learnt to harvest the wind producing powers of the human digestive tract and we will all power our houses by means of turbines connected via tubes to our anus...
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Probably a mix, some old, some new. I would think there would be some form of a common electric car as battery technology improves, but also ethanol and/or biodiesel based cars. Hydrogen, like electricity, can be used for energy transmission. I wouldn't rule out the continued use of coal and other fossil fuels. Fusion generators would be great, perhaps we will have it in 100 years. Also I think we will continue to make things more efficient in their energy use. In the near future I forsee ethanol being very important. It's basically the same as oil, except we simply grow it instead of sucking it out of the ground, plus in this form it doesn't release CO2, and burns cleaner and more efficiently, which will make cars more powerful and cheaper to fuel, and emit less harmful gasses. How about ethanol power plants? Something to think about.
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I would expect to see electricity in use for just about everything including heating, and cooking. The electricity would be produced for the grid using nuclear, geothermal, hydrogen, solar, and wind. Those not on the grid (by choice or too remote) will use solar and wind just as they do today. I think fossil fuels will begin to take a backseat as costs to recover it rise.
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None, in a hundred years, we will all be dead :=P
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electricity. hydrogen powered cars. and nuclear fusion.
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