In parts of Russia, Scandinavia and eastern Canada, temperatures exceeded the old averages by 9 degrees Fahrenheit (5 C).
Warmer temperatures mean melting snow and ice. The extent of Arctic sea ice was 5.3% below the average from 1981-2010, and Antarctic sea ice was 9.8% below the average.
The hottest January after the second hottest year on record “is one of those indications that things are warming dramatically,” said University of Illinois climate scientist Don Wuebbles.
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