By their nature, sports stadiums are generally not very sustainable. A typical stadium will sit for days unused, then suddenly one day, 10,000 people will flush the toilets at the same time. But the new stadium for the Washington Nationals in D.C. is doing its best to combat the innate wastefulness as the first LEED-certified stadium in the US. Built by HOK, the global stadium experts, Nationals Park is great example of folding sustainability into our modern standard of building. Now sports fans can enjoy a hot dog, wave a big foam finger, and help (or at least refrain from hurting) the environment all at the same time.