Photo taken on May 1, 2020 shows a garbage sorting facility in Chaoyang District of Beijing, China. Beijing on Friday began to carry out mandatory garbage sorting in new efforts to protect the environment. With the city's newly revised household waste regulation taking effect, Beijing requires people to classify household waste into four categories: kitchen, recyclable, hazardous and other waste. (Xinhua/Zhang Chenlin)

Young volunteers make handicrafts to promote garbage sorting in Chaoyang District of Beijing, China, May 1, 2020. Beijing on Friday began to carry out mandatory garbage sorting in new efforts to protect the environment. With the city's newly revised household waste regulation taking effect, Beijing requires people to classify household waste into four categories: kitchen, recyclable, hazardous and other waste. (Xinhua/Zhang Chenlin)

A volunteer explains garbage sorting to a local resident in Chaoyang District of Beijing, China, May 1, 2020. Beijing on Friday began to carry out mandatory garbage sorting in new efforts to protect the environment. With the city's newly revised household waste regulation taking effect, Beijing requires people to classify household waste into four categories: kitchen, recyclable, hazardous and other waste. (Xinhua/Zhang Chenlin)

Photo taken on May 1, 2020 shows a repainted garbage truck in Chaoyang District of Beijing, China. Beijing on Friday began to carry out mandatory garbage sorting in new efforts to protect the environment. With the city's newly revised household waste regulation taking effect, Beijing requires people to classify household waste into four categories: kitchen, recyclable, hazardous and other waste. (Xinhua/Zhang Chenlin)

A sanitation worker cleans a garbage sorting facility in Fengtai District of Beijing, China, May 1, 2020. Beijing on Friday began to carry out mandatory garbage sorting in new efforts to protect the environment. With the city's newly revised household waste regulation taking effect, Beijing requires people to classify household waste into four categories: kitchen, recyclable, hazardous and other waste. (Xinhua/Li Xin)

A sanitation worker disinfects a kitchen waste facility in Fengtai District of Beijing, China, May 1, 2020. Beijing on Friday began to carry out mandatory garbage sorting in new efforts to protect the environment. With the city's newly revised household waste regulation taking effect, Beijing requires people to classify household waste into four categories: kitchen, recyclable, hazardous and other waste. (Xinhua/Li Xin)