China will host this year’s global World Environment Day celebrations on June 5 in Hangzhou, Zhejiang Province, on the theme of air pollution. Joyce Msuya, acting director of the United Nations Environment Programme, welcomed China’s selection as host.“The country has demonstrated tremendous leadership in tackling air pollution domestically. It can now help spur the world to greater action.” With its growing green energy sector, China has emerged as a climate leader. The country owns half of the world’s electric cars and 99 percent of the world’s electric buses, according to UN.