The tropics may be expanding

Scientists don't know if global warming is responsible
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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<p><a href="http://www.physorg.com/news67788980.html">The tropics may be expanding</a></p> <p><b><i>Scientists don't know if global warming is responsible</i></b> <br>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.</p>