How could we use ocean water?

Even with all of the water in Earth's oceans, we satisfy less than half a percent of human water needs with desalinated water.* We currently use on the order of 960 cubic miles (4,000 cubic kilometers) of freshwater a year, and overall there's enough water to go around. There is increasing regional scarcity, though. read more

The way sea water moves in the form of ocean currents and the tide coming in and going out is another source of energy. The best marine-current energy source in the U.S. is in the Gulf Coast around the tip of Florida, the U.S. Department of Energy (DOE) reports. read more