Special transport vehicles full of waste are seen at a waste disposal plant of Chongqing Environment &Sanitation Group in Chongqing, southwest China, June 27, 2019. Chongqing has been striving to promote garbage sorting in recent years. A garbage classification system has covered 680,000 households from 1,796 communities of 39 streets and towns in the downtown area of Chongqing. (Xinhua/Liu Chan)