The American Chemical Society recently took another major step in transforming its headquarters into one of the most energy-efficient and sustainable structures possible with existing technology by starting construction of a meadow on the green roof for its headquarters building. Only 1 in 10 office buildings in the Washington, DC, area have these innovative surfaces, according to Joanna Brosnan, director of American Chemical Society 's Facilities Department, who initiated the project. Green roofs use green plants growing on a specially engineered surface to absorb carbon dioxide from the air, save energy on heating and cooling, promote cleaner air, and reduce storm-water runoff that can overburden city sewers.

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