Thoreau's Walden Pond Shows Effects Of Global Warming, Invasive Species On Area Today

04/13/2010 05:12 am ET | Updated May 25, 2011
  • John Platt Scientific American

Henry David Thoreau famously catalogued the plants around Walden Pond more than 150 years ago, and the information he gathered then is helping to illustrate the effects of invasive species and global warming on the area today.

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