John Hill, from the Board of Church and Society at the United Methodist Agency, narrates the video below about their recent green roof addition. The series of squares used covers the entire area of the flat roof, reducing energy consumption, making the building cooler in the summer and warmer in the winter. In addition, and equally important, it reduces storm water runoff. When it rains, the water remains in the roof rather than adding pollutants into the nearby watershed, which feeds into the Chesapeake Bay.