New England is a naturally forested landscape and has been for thousands of years. On Thursday, October 27, beginning at 6 pm, Peter Del Tredici, botanist and senior research scientist at the Arnold Arboretum, will present an overview of the recent history of the forests of southern New England as impacted by natural disasters, shifting land-use patterns (urbanization and suburban sprawl), introduced pests and pathogens, invasive species, acid rain, and climate change. He will speculate on how the â€œemergentâ€ forests that develop in response to these factors will differ from those that dominated New England in the past. Free and open to the public, Geological Lecture Hall, 24 Oxford Street. Cosponsored with the Arnold Arboretum of Harvard University. Part of the Challenges and Choices lecture series.Â For more information, visit www.hmnh.harvard.edu.