Wave Power

How much refuse has been dumped in the ocean with the defense of "infinite dilution"? The coral reefs now prove the fallacy of that defense yet we now forge ahead with the same ignorance and arrogance that brought us where we are today:

Wave Power to go Commercial from ZDNet

Here's the question: How much do these devices have to affect ocean currents before it causes a problem? Has anyone really considered it, or do they simply assume that they are so small as to have no effect?