Question

Covering 71 percent of earths surface, the oceans play an essential role in maintaining the conditions for human existence on land, moderating temperature by the absorption of heat and carbon dioxide, and giving pure water back to the atmosphere through evaporation.

Answer 1

Yes it's true that the ocean is contributing most of it on the earth by reversing the hydrological cycle.
The heart evaporated also ensures that the OTEC is been used correctly as well as it contributes in the works of wave and tidal energies.
As you said oceans make the water fresh.It is essential to use it carefully.

Hope you understand what you want to.

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