The “greenest” building is the one you don’t have to build. A “green” building is one whose construction and operation ensures the healthiest possible environment and makes the most efficient and least disruptive use of land, water, energy and resources. The #1 principle of green building design is to renovate and recycle existing buildings. Older schools usually boast numerous features that can help meet the five principles of building “green” espoused by the United States green Building Council’s rating system, called Leadership in Energy and Environmental Design (LEED). Green building design integrates materials and methods that promote environmental sustainability, economic vitality and social benefits through design, construction and operation of the built environment.