Earth's oceans have long been recognized as a potential source of energy. Indeed, for centuries some of this potential has been put to use by sea-farers who have exploited favorable winds, tides, and currents to speed their passage. More recently, the international push to develop sustainable alternatives to the continued reliance on fossil fuels has rekindled interest in a variety of renewable energy sources, including those of the marine environment. Waves, tides, winds offshore, and ocean currents are all potential sources of renewable energy that are under active investigation as possible contributors to a diversified portfolio of energy sources for a sustainable future.
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