04/22/2011 12:04 pm ET Updated Jun 22, 2011

Books That Changed The Way We Think About The Earth

We may be incredibly pessimistic about the direction our country is headed at the moment, but so were many residents back in the last days of Manifest Destiny, when Henry David Thoreau wrote Walden. (If you’re angry with President Obama, think about having Franklin Pierce as the commander-in-chief.


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