Originally Posted by Harle-Quin
Pumping water uphill then re-using it on the way down won't generate extra energy...
basic physics comes into play: you can't get something from nothing; pumping water uphill for re-use it too much like perpetual motion. I suppose it'd work if you could use a phenomenally efficient means for pumping that water up, though...
There's another form of energy that is truly worldwide and never runs out or diminishes: that energy is the difference in air pressure at sea level, that occurs between high tide and low tide. Problem is, it's a fairly subtle change and hard to harness. But if there *was* an easy way to do it, you'd have the cleanest possible energy source, one that'll never diminish. I think there have been experiments with using this source of power, but without substantially beneficial results.
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