2. Washington Nationals Stadium. The Mets get this year’s moment in the centerfield spotlight, but last spring’s big debut happened farther south. The Nationals tacked on $2 million to a nearly $700 million price tag in order to add features that earned this stadium a LEED rating from the U.S. Green Building Council — the first in the country to do so. From an in-house recycling center to a wastewater system designed to filter out peanut shells and hot-dog bits, the D.C. team thought of everything — except for screening out objectionable anti-green sponsors. Ah well, you can’t win ‘em all.