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Sep 26, 2016, 6:00 pm150 pts
Ars Technica
Enlarge (credit: NSIDC/Ted Scambos) When it comes to understanding the Earth's past climates, we have to understand what the global temperatures were. Instrument readings only go back to the 1800s, so researchers have had to rely on proxies—things we can measure, like tree ring width or oxygen isotopes, that…
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