GUIYANG, July 9, 2016 (Xinhua) -- Participants walk past the booth of World Wide Fund for Nature (WWF) in the conference hall during the opening ceremony of the Eco Forum Global Annual Conference 2016 in Guiyang, capital of southwest China's Guizhou Province, July 9, 2016. The opening ceremony was held here Saturday, with the theme of "Embracing New Era of Eco-Civilization: Advancing Green Development, Unifying Knowledge and Action". (Xinhua/Liu Xu)