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Steven Spurlock, a horticulture specialist with the Virginia Living Museum in Newport News, Virginia, conducts garden maintenance atop a green roof, Monday, July 26, 2010. Green or living roofs mitigate run-off by catching and filtering storm water, and they can help keep things cool on a hot day. Adding to the green appeal of this particular roof is its low maintenance nature, only requiring weeding about once a year, said Spurlock. These photos were taken as part of the Rapid Assessment Visual Expedition with the International League of Conservation Photographers and the Chesapeake Bay Foundation. During a RAVE, a team of photographers fan out across a region to document environmental issues affecting the area in a short amount of time. For this assignment, photographer Morgan Heim has 10 days to document as many aspects as she can to illustrate the causes, impacts, mitigation and nature tied to runoff in the area. (Photo/Morgan Heim)