A Super Bowl village, a black history museum, and a Thom Mayne house in New Orleans have absolutely nothing in common except this: They've signed on to become some of the greenest landscapes in the country.

More to the point, they're among 175 pilot projects worldwide to enlist in the Sustainable Sites Initiative, a new rating system for environmentally friendly land development. (Read our past coverage here.) Over the next two years, they'll be tilling soil and planting native grasses and showering plants with rainwater to meet the standard. Call it the landscaper's LEED, the U.S Green Building Council's green rating system.

Sustainable landscape certification might sound a bit redundant. People throw green roofs onto their buildings to earn LEED points, so why do the lawns need to prove their eco cred, too? "Just because landscapes are green doesn't mean they're sustainable," Steve Windhager, of the Sustainable Sites Initiative, tells us. "Most landscapes are waterhogs. We want to go beyond conservation. The opportunity in landscape design is that we can actually replenish the Earth's ability to sustain life."

This makes sense for botanical gardens and nature preserves, but some of the pilot projects sound like the last places on Earth that could sustain life. (There's a power plant in Southern California and an industrial park in Oregon and a facility cryptically called the Deep Underground Science and Engineering Lab in South Dakota.) In Windhager's telling, that's all the more reason to become a Sustainable Site. Seemingly small efforts like tree islands in parking lots and capturing rainwater in dense urban areas can have a big impact on the environment -- even if they won't produce the next cover shot for Better Homes and Gardens.

The pilots will help hammer out the final rating system in coming years. They'll also inform a guidebook that the Sustainable Sites Initiative expects to release in 2013.

We're all for greening up landscapes. We wonder, though: There's already a deluge of environmental certificates on the books. Do we really need one more? Or is labeling something green the only way we know how to be green?