The Washington Nationals will play their baseball season opener Sunday in the first green-built professional stadium in the U.S. The LEED Silver certified ballpark was built on a restored brownfield, and many building materials were produced locally. The stadium boasts efficient lighting and plumbing, drought-resistant plants, a concession area with a green roof, filters to keep stormwater runoff out of the nearby Anacostia River, and proximity to public transit (as well as a shortage of parking). Throwing out the ceremonial first pitch as the Nats take on the Atlanta Braves: President George W. Bush. He’s sure to be hit. Er, a hit.