The oceans don’t suck up heat and keep it. The currents go north and south and release it. This stuff is for the incredibly credulous.
I remember reading a si-fi story back in the 1960s, about a mad scientist who planned to melt the ice caps and flood the earth.
His method was he was going to blow up underwater cliffs that blocked the gulf stream from going farther north into the Arctic.
Every time I ear the ice caps are melting I remember this novel.
Can’t remember the name of it.