The total output value of China's forestry industry exceeded 7.1 trillion yuan (1.1 trillion U.S. dollars) in 2017, the Chinese National Forestry and Grassland Administration said  on Sunday.  The output was only about 134 billion yuan in 1994, not more than one fiftieth of the latest figure, officials from the administration said during the three-day Eco Forum Global Annual Conference that closed in southwest China's Guizhou Province on Sunday.  Trade volume of forest products topped 150 billion U.S. dollars last year, according to the administration.  China is ...