Headlines about record-breaking heat tend to reference a start date. These days, it’s 137 years—as in “2016 was the hottest year on record in 137 years,” or this one, about July 2017: July 2017 was statistically tied with July 2016 as the warmest July in the 137 years of modern record-keeping. https://t.co/U3dAxGzGzW pic.twitter.com/uR6JOR7RXB — NASA…

via Why does all our climate data start in 1880? — Quartz

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