• “Reducing Plastics in Our Lives,” 2 p.m. at Belfast Free Library. Chrissy Adamowicz of the Natural Resources Council of Maine discusses global plastic pollution, including its sources and solutions. Her Belfast Garden Club talk is free.


  • Talk on Fire Safety Challenges for Historic Homes, 7 p.m. at Watts Hall, 174 Main Street, Thomaston. Fire Chief Mike Mazzeo discusses fire prevention for people buying or restoring old homes, where steep stairs, balloon construction, concealed spaces, lack of fire stops between floors, and old electrical systems may pose hazards.


  • Recycle Eyeglasses, Hearing Aids, Cell Phones in Camden, at Reny’s Plaza, from 10 a.m. to 3 p.m. Camden Lions Club will collect unwanted items to be sent to countries where they are needed.
  • Green & Healthy Maine Home + Energy Show, 10 a.m. to 5 p.m. at East End Community School, 195 North Street, Portland. Learn about heat pumps, electric vehicles, edible landscapes, Maine’s energy-efficiency incentive programs and more in workshops and at vendor booths. Details: GreenMaineHomes.com.


  • Symposium on Maine’s New Forest Economy, Wednesday, October 23, from 1 to 4:30 p.m. in UMaine’s Wells Conference Center, 131 Munson Road, Orono. Learn more and register for the free event at EventBrite.com (enter Maine’s New Forest Economy in the search bar).
  • “Nutrient Management in High Tunnels,” Thursday, October 24, 5 p.m. at Sheepscot General Store and Farm, 98 Townhouse Road, Whitefield. Bruce Hoskins tells how the lab at University of Maine tests soil in high tunnels, unheated hoophouses that offer heat gain, season extension and control of plant diseases, but provide challenges for managing soil nutrients. Free. Sign-up: knox-lincoln.org/farmer-gardener.
  • Chainsaw Safety Course, at Hidden Valley Nature Center, Jefferson, the morning of Saturday, October 26, and all day Sunday, October 27. $150 ($130 Midcoast Conservancy members). Details are at MidcaostConservany.org.