As we delve into the fractal complexities of nature it is easy to overlook very simple things. The hypothesis of human global warming is based on the correlation of the slopes of global atmospheric temperature increase from the late 1970′s to the late 1990′s and human CO2 emissions. A plausible hypothesis, but evidence from the ice cores tells us that CO2 follows temperature like a poodle on a leash and evidence from the geological record tells us that glaciations have occurred during periods of vastly higher atmospheric CO2. There are also the problems of explaining how human CO2 at 1/2500 of the atmosphere can cause all that warming, and how the oceans which are opaque to the IR radiation emitted by greenhouse gasses could have warmed, and why the atmosphere has not continued to warm since 1997 in spite of accelerating human CO2 emission.
In my backyard the trees grew taller since 1979 and my baldness increased at about the same rate but both of these processes have continued since 1997 and atmospheric warming has not.So what else has happened since the late 1970′s, something well understood to warm the oceans which are the flywheel of global enthalpy, and which have continued to warm since 1997?
This is just a hypothesis, but one I would argue is at least as plausible as human CO2. Wild ideas just come to me while doing menial things. A good way to test it would be the surface temperature of the Southern Ocean which according to the above paper has experienced a 20% increase in UV radiation. Adjusted for cloud and high latitude incidence reflection, the Southern Ocean should show the greatest surface warming of all the oceans.