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London is always on the cutting edge of trends, and green buildings are no exception. One of the most well-known ecologically friendly buildings sits prominently on the London skyline. Affectionately known to Londoners as “the gherkin,” the building reduces wind resistance at ground level due to its ellipsoid shape. Green buildings also reduce their impact on the environment by employing unique ventilation and energy-saving structures (such as double-pane windows for greater insulation) to decrease the use of air conditioning. Locally, the Chesapeake Bay Foundation headquarters in Annapolis stands as one of the greenest buildings in the world. Learn more about how green buildings can reduce their impact on the environment at the Women’s Council on Energy and the Environment’s brown-bag session, “Green Buildings: Good for the Environment, Economy and Society,” at noon at Navigant Consulting, 1801 K St. NW. $15. (703) 351-7850. (Kristen Berg)