EPA@40 Celebration / Earth Day 2010 . National Sustainable Design Expo . National Mall between 7th and 3rd Streets and Madison and Jefferson Drives . Washington DC . Sunday, 25 April 2010 . Elvert Xavier Barnes Photography

EPA@40 Celebration / National Sustainable Design Expo
http://www.epa.gov/earthday

Visit my 40th Earth Day 2010 webpage at http://elvertbarnes.com/40thEarthDay2010-WDC.html