Perhaps because images of fire are so frightening, or because fire can leap up with apparent randomness, or because (particularly in California) flames have subsumed the homes of the very affluent, wildfires have become one of the most potent political symbols of global temperatures run amok.18 The real story bears little resemblance to such alarmist storytelling. To begin with, over the past 150 years our exposure to fire has dropped dramatically. The examination of sedimentary charcoal records spanning six continents and two millennia shows that in fact global burning has declined sharply
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