Cary Institute of Ecosystem Studies: The Ecological Homogenization of Urban America Ecologist Peter Groffman will explain how similarities in patterns of roads, neighborhoods, commercial areas, landscaping, and water features across the United States can help us understand land use change from local to continental scales. 7 p.m. Auditorium. 2801 Sharon Turnpike (Route 44), Millbrook. (845) 677-5343; www.caryinstitute.org.