Evidence For Past Temperatures
See also: paleoclimatology and paleothermometerOur evidence for past temperatures comes mainly from isotopic considerations (especially δ18O); the Mg/Ca ratio of foram tests, and alkenones, are also useful. Often, many are used in conjunction to get a multi-proxy estimate for the temperature. This has proved crucial in studies on glacial/interglacial temperature.
Read more about this topic: Geologic Temperature Record
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“Yet in spite of all they sang in praise of their “Eliza’s reign,” we have evidence that poets may be born and sing in our day, in the presidency of James K. Polk.”
—Henry David Thoreau (1817–1862)