So, is the consistent rise in SST due to human activity, or other factors? When unbalanced regions are generally showing "warmer" SSTs, it's not just vertical sea currents, upwelling cooler water or lack of it. The most powerful explanation is deeper ocean temp changes....increased heat coming up from underneath. Sun radiation can be a factor, but unless we're measuring deviations in solar radiance, the scientists are viewing the run radiance as a virtual "constant". The observed 11y or 22y sunspot cycles are in magnitude, about 0.1%.... The Milankovich cycles are thousands of years, related to changes in the earth's shape, precession, and astronomical rotation/environment. These cycles are verified by geological sampling and analysis. Nothing we have found correlates with the most impressive earth climate cycle of all..... The Ice Ages...... a one hundred thousand year cycle give or take ten thousand years. Changes in the earth's thermal flux are generally believed to be declining functions of heat being lost forever, but some scientists talk about heat of crystallization as the earth solidifies, and fission reactions generally believed to be declining like all bodies of materials containing fissionable nucleides. But a recent Nature article, and another very recent publication, discuss how known fission and cooling processes account for only half of the Earth's heat flux, and postulate LENR reactions as supplying the balance. The LENR reactions have a likely pattern of increasing output, Thought to have begun just 2.2 million years ago, and dependent on some "loading" of a crystalline metal under the temperatures and pressures within the Earth. So it is possible that net heat flux can be on the rise..... And far more important to Earth climate than Man.