Over the past 10 years, **Richard Primack** and his colleagues and students have been using the journals of Henry David Thoreau and the meticulous records kept by other residents of Massachusetts to reconstruct the history of climate change in Massachusetts. In this lecture Professor Primack discusses how the warming climate is affecting plants, birds and insects in Massachusetts and the northeast in general. The Primack Lab's Concord project is considered a major contribution to the science of climate change. Dr. Primack is an international figure in conservation and his textbooks are major resources in university conservation courses.