Uploaded April 2009 | Updated September 2026, 8 hours ago
More than 150 years later, researchers are using Henry David Thoreau's meticulous records to gather evidence of how the climate has warmed in the area of Walden Pond. sciencentral.com/video
More than 150 years later, researchers are using Henry David Thoreau's meticulous records to gather evidence of how the climate has warmed in the area of Walden Pond. sciencentral.com/video
