We can all agree the globe has gotten warmer over the past several decades. Here’s another summary statement from the IPCC’s AR5: [S]ince about 1950 it is very likely that the numbers of cold days and nights have decreased and the numbers of warm days and nights have increased . . . there is medium confidence that globally the length and frequency of warm spells, including heat waves, has increased since the middle of the 20th century.10 The science pointing to longer or more frequent warm spells like heat waves inspires a lukewarm “medium confidence,” but that of a general trend toward warmer
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