Long before he had ever heard of global warming, Loren Downey caulked windows, installed insulation and took care of all the other energy-saving tasks that come with owning a 130-year-old home. Now the same tasks he performed as a responsible homeowner have become a responsibility of his faith. Downey is a founder of the EarthCare team at the First Parish Congregational Church in Saco, where church members are replacing windows, conserving hot water and taking other steps to save energy and combat global warming, both at church and at home. The EarthCare team is one of three dozen around the...