That’s true, but I still don’t think we can raise ocean temperatures through direct cooling and renewable sources the way that the greenhouse effect can. Water can absorb a lot of heat energy without changing temperature, and that is why regions close to oceans have a more temperate climate.

While I don’t have enough knowledge in this field to be making any definitive statements, my logic is as follows:

• outside of nuclear fission/fusion reactions, heat energy on the earth’s surface comes from either the sun or molten rock in the core
• that energy is responsible for everything that happens on earth, including wind energy

So we would need to get energy from off planet, use nuclear fission/fusion, or cover enough of the land area in wind and solar farms in order to redirect the sun’s energy over to the oceans.

I think the bigger concern, when it comes to heating the ocean, is that manufacturing, construction, and transport related to the data centers still releases a lot of greenhouse gases. Those gases trap the sun’s energy within our atmosphere and that WILL heat up the earth. Way more than direct cooling using ocean water.