Mankind needs to reduce its aquatic thermal foot print. We can start by banning all aquatic weapons testing around the globe, then we need to investigate all major aquatic thermal contributors to see how we could start reducing this massive unnatural contribution. City sewers, all of the major shipping industries including the worlds Naval vessels, and nuclear reactors are considered major contributing factors along with several others. Just as airliners leave thermal exhaust trails in the sky, large ships leave thermal trails within the oceans. And because the direction of conduction is down and in within most of the oceans surface, the thermal contribution collects well below the surface. Remember heat transfers to cold, and the oceans are coldest at their depths, due to the surface layer being heated by the suns solar contribution.