Heat storage of the sea is increased during the summer time by pumping relatively warmer surface water with wave-action pumps to the deeper layers with relatively cooler water. In locations where currents are minimal in these deeper layers, the lateral displacement of the warmer water introduced by wave-inertial pumps will be minimized. During the winter season, this additional heat will intensify evaporation from the sea, which will increase precipitation in the nearby continental zone. This “natural desalination process” using the energy of surface waves will bring additional freshwater to arid coastal areas during wintertime.