Wind energy but maybe more
The movement of air to move wind generators is trivial compared to giant undersea turbines put in the path of ocean currents. Water has much more energy for a given cross section. There are far more possibilities for generating power from ocean currents that are less problematic concerning interactions with the biology of the planet. I'm not speaking of tidal power, that is very intrusive to the natural biology of the inlets that could make use of that. Actually it can be quite disastrous. The ocean current projects would be big money items but worth the effort. Come on now, lets get on it.
