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

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

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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