Photo taken on Sept. 17, 2015 shows the green roof on the Jacob K. Javits Convention Center in New York, the United States. The Jacob K. Javits Convention Center is home to the latest architecture project in New York - a green roof the size of about five football fields and the largest in the Northeast region of the United States. This roof upgraded a commitment to sustainability that is expected to achieve an estimated 26 percent reduction in the Javits Center's energy use. (Xinhua/Wang Lei)
