The tropics may be expanding
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This map of the Earth shows areas of particularly strong warming of the lower atmosphere in yellow, orange and reddish colors. Note the enhanced warming of midlatitude regions north and south of the equator, indicating the expansion of the tropics. The map also shows pronounced warming at Arctic latitudes. Credit: Qiang Fu, University of Washington
Atmospheric temperature measurements by U.S. weather satellites indicate Earth's hot, tropical zone has expanded farther from the equator since 1979, says a study by scientists from the University of Utah and University of Washington.
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