Seems good, but, now, we’re mixing the energy into the deep ocean. The life down there is accustomed to the environment it has, now we’re giving it our excess heat. What happens when the sea bottom equalizes with the top, no more heat sink. Part of the Gulf Stream and other ocean currents include the cold return currents. I read in Scientific American some years ago that during interglacial periods, the ocean currents were minimal or none and there was no life below 200 meters or so, causing anaerobic conditions and an excess of hydrogen sulfide and other stuff in the atmosphere. Good for making petroleum, but bad for us. We really don’t know what the day to day weather was in those conditions, worse?