A University of Arizona-led team has nailed down the temperature of the last ice age – the Last Glacial Maximum of 20,000 years ago – to about 46 degrees Fahrenheit.

This global map shows the temperature differences compared to preindustrial times. Dark blue translates
 to cooler temperatures. The ice sheets of the past are superimposed on the continents
[Credit: Jessica Tierney]Their findings allow climate scientists to better…

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Source: archeo