A paper published today in Geophysical Research Letters finds that clean air laws which greatly reduced sulfur dioxide emissions explain 81% of the "brightening" of sunshine and 23% of the surface warming in Europe since 1980. However, the authors note "this phenomenon is however hardly reproduced by global and regional climate models."
According to the paper,
"observed surface solar radiation, as well as land and sea surface temperature spatio-temporal variations over the Euro-Mediterranean region are only reproduced when simulations include the realistic aerosol variations" which the authors state are "however hardly reproduced by global and regional climate models"
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