Project Learning Tree will present a professional-development workshop for teachers — Environmental Experiences for Early Childhood (PreK-K) — at the Massachusetts Department of Conservation and Recreation’s Brookwood Community Farm in Canton on August 20, 10AM-1:30PM.  Cost is $15 per person.   For questions or to register (by August 13), contact Gini Traub at Gini.Traub@state.ma.us or 413-584-6788.  Project Learning Tree’s award-winning environmental-education program is sponsored by the Massachusetts Executive Office of Energy and Environmental Affairs.