Scientific American profiles emerging sources of renewable energy from the ocean in the cleverly titled: It came from the sea--renewable energy, that is.Whether it is from tides, or waves, or water temperature differences, using underwater turbines, tubes, or accordion buoys, there are many exciting developments. Experimental operations are popping up around the world, and a full-fledged commercial "wave farm" is being put in place off Portugal.
I find the buoy approach the most fascinating. Imagine a couple square kilometers of these submerged under the water a few miles off the coast, powering an entire community.
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