ocean currents as alternative energy

Ocean currents are also gaining significance as a possible form of alternative energy. Because water is dense, it carries an enormous amount of energy that could possible be captured and converted into a usable form through the use of water turbines. Currently this is an experimental technology being tested by the U.S., Japan, china, and some of the European Union countries.

Whether ocean currents are used as alternative energy, to reduce shipping costs, or in their nature to state to move species and weather worldwide, they are significant to geographers, meteorologists, and other scientists because they have a tremendous impact on the globe and earth-atmosphere relations.

I learnt that it reduce shipping cost by changing the ocean current and that the currently this is an experimental technology being tested.

With ocean current is all pulls some where normally towards the land.

I wonder how people use water in turbines.