How to generate energy from the temperature gap of sea bottom and sea surface?

The whole edifice of moden civilization is based on energy for which there is no substitute. Energy demand increasing not only because of population growth but also the need to attain higher standard of living. All existing energy sources are not sufficient in future. Even nuclear energy has its own limitations and expensive. In this situation is there any way to produce energy from sea bottom? Temperature difference or gap between sea surface and sea bottom can be harnessed to creat a unlimited supply of energy. As 71% area of earth covered with sea and ocean and only 21% of land. Then a very large amount of energy may be produced from sea bottom in future.

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