The solar aa index predicts global sea surface temperatures to 2000 better than CO2, and as well as CO2 combined with the aa index. After 2000 CO2 is needed in…
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Stefani on the Sun vs. CO2 as climate drivers

By Andy May on March 3, 2026
The solar aa index predicts global sea surface temperatures to 2000 better than CO2, and as well as CO2 combined with the aa index. After 2000 CO2 is needed in the regression.
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