(VA) (EcoAction Arlington) The 21st annual Green Community Tour will showcase sustainable homes and gardens in Arlington. Features include energy efficient and water-saving technologies, solar energy, rain gardens, native plants, wildlife habitat and more. Visit the county’s website for more details and videos. The simultaneous Green Community Celebration at Arlington Central Library will feature electric vehicles, exhibits and family-friendly fun! 11-12:30: Community ...

(DC) (Smithsonian Associates) The Washington, D.C., area is becoming a greener urban environment. Bill Keene, a lecturer in urban studies, architecture, and history, spotlights innovative approaches to the environment and sustainability that have taken root—sometimes literally—in many types of buildings around town. Begin the day in the Navy Yard neighborhood at the rooftop garden of the office building at 55 ...