Yes it's complicated. If one wants yearly resolution to climate prediction. But the relationship between atmospheric levels of CO is a simple and direct one. CO2 levels act like the setpoint of the earth's thermostat. The following relationship is pretty direct.
The relationship between the earth including the ocean's heat and CO2 levels is even more direct. There is a very high probability that trends will continue and as CO2 levels continue to rise so will the earths's heat content, as they have been. It's not that hard to model these general trends. As they get a better handle on the ocean the resolution of the models should get better.
Your post as usual is ludicrously pretentious but worse, your conclusion is wrong. Hell, you can't even admit the recent CO2 spike is from man.