Earth's dirty little secret: Slowly but surely we are skinning our planet

Throughout history civilizations expanded as they sought new soil to feed their populations, then ultimately fell as they wore out or lost the dirt they depended upon. When that happened, people moved on to fertile new ground and formed new civilizations.

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<p><a href="http://www.physorg.com/news95954293.html">Earth's dirty little secret: Slowly but surely we are skinning our planet</a></p> <p>Throughout history civilizations expanded as they sought new soil to feed their populations, then ultimately fell as they wore out or lost the dirt they depended upon. When that happened, people moved on to fertile new ground and formed new civilizations.</p>