Speaker: Peter M. Groffman, Cary Institute of Ecosystem Studies For Ages: Adults FREE – Donations appreciated. No registration required. The Baltimore Ecosystem Study has been conducting research on the “city as an ecosystem” in Baltimore City and County since 1998. The streams, forests and soils at Oregon Ridge Park have been an essential component of this work, providing a “reference” condition for the urban, suburban and exurban components of the region. The talk will review what we have learned about the ecosystems in the park and what they tell us about the ecology of the world that we live in.