There are a lot of decade-scale cycles that pump heat energy around the earth system, making it pile up more rapidly in the atmosphere than the deep hydrosphere or vice versa, and various other similar things . Patterns at timescales shorter than a decade or so are almost meaningless as a result.
Well the question is less about heat energy and more about land-ocean surface temperatures. In the debate, both sides agreed that the climate heat content was increasing and that this was due to human activity. The disagreement was about whether surface temperature models should be taken seriously or not.
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