Dust in West up 500 percent in past two centuries

The West has become 500 percent dustier in the past two centuries due to westward U.S. expansion and accompanying human activity beginning in the 1800s, according to a new study led by the University of Colorado at Boulder.

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<p><a href="http://www.physorg.com/news123082956.html">Dust in West up 500 percent in past two centuries</a></p> <p>The West has become 500 percent dustier in the past two centuries due to westward U.S. expansion and accompanying human activity beginning in the 1800s, according to a new study led by the University of Colorado at Boulder.</p>