Here's another energy source that is starting to attract attention.
We've posted a number of items about ocean power (aka tidal power or wave power).
In essence, the flow of water back and forth in the daily tides could be tapped for energy.
Oh, and one last cool thing about ocean power. Tides are generated from the pull of the Earth's moon. Ocean power can, in all seriousness, also be called Lunar Power.
Of course, this means pushing the Moon into an orbit farther from the Earth, and at the same time, slowing the Earth's rotation. The Moon used to be a lot closer, and will eventually settle into an orbit farther away, at about the same time the Earth's rotation has slowed to match the Moon's revolutions. At this point, this resource will be "used up".
I wonder how far along the process we are right now.
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