Students made the Bronx a little greener by installing 2,000 square feet of green roof atop the St. Mary’s Recreation Center in the South Bronx.

The newly-created Youth Sustainability Corps will expand the 200,000 square feet of green roofs overseen by the Parks Dept. — rooftops outfitted with features like native plants, hydroponic towers and bee hives — by 50,000 square feet.