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Concerns over global warming have scientists and engineers looking for cleaner alternative sources of energy.

One of those alternatives gaining momentum involves harnessing the energy of the ocean.

Renewable energy experts say in theory, energy from tides, currents and waves could double the hydropower output in the U.S., producing 20-percent of the nation's electricity.

But the technology to capture this renewable energy is in its infancy.

NHPR's Amy Quinton reports on the effort in New Hampshire's seacoast to tap the power of the tides.