Marine energy – YouTube

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Of all renewable energy sources, marine energy (also called ocean, or maritime energy) is the one that still has the furthest to go to achieve commercial maturity. The most important advantage of marine energy is that it is a source of high energy density, which means that a large quantity of energy can be obtained from a small occupied surface area. The chief disadvantage is the the great difficulty in extracting the energy in such a hostile environment.

via Marine energy – YouTube.