I’ve never understood the Grand Solar Minimum argument that it’s going to cause falling temperatures and major drops in agricultural output. After all, The Maunder Minimum didn’t start until 1645 but The Little Ice Age was well underway before then. How does that bolster the argument that reduced sunspot activity will cause temperatures to drop?
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Experts disagree about whether the earlier 1300s start should be included in The Little Ice Age :
Armstrong blogged recently the theory that it might be reduced cosmic radiation that forms the causal correlation to increased volcanic and tectonic activity. Increasing volcanic soot emissions can exacerbate global cooling, e.g. the Year Without a Summer.
Presumably solar activity peaked in the 11th or 12th century?
P.S. the huge rise “hockey stick” at the right edge of the chart above is a lie constructed from manipulated temperature data.