A student has lunch at a primary school in Changning District of Shanghai, east China, Sept. 2, 2020. The school promotes the "Clear Your Plate" campaign to stem food waste as new semester begins. (Xinhua/Ding Ting)

A teacher tells stories before having meals at a kindergarten in Changsha, central China's Hunan Province, Sept. 2, 2020. The kindergarten has cultivated children's awareness of treasuring food from a very young age and helped them form good eating habits. (Xinhua/Chen Zeguo)

A teacher instructs a student to draw a picture about treasuring food at a kindergarten in Changsha, central China's Hunan Province, Sept. 2, 2020. The kindergarten has cultivated children's awareness of treasuring food from a very young age and helped them form good eating habits. (Xinhua/Chen Zeguo)

Students return plates after lunch at a primary school in Changning District of Shanghai, east China, Sept. 2, 2020. The school promotes the "Clear Your Plate" campaign to stem food waste as new semester begins. (Xinhua/Ding Ting)

A teacher helps students make out crops at a kindergarten in Changsha, central China's Hunan Province, Sept. 2, 2020. The kindergarten has cultivated children's awareness of treasuring food from a very young age and helped them form good eating habits. (Xinhua/Chen Zeguo)

A student is on the way to return his empty plate at a primary school in Changning District of Shanghai, east China, Sept. 2, 2020. The school promotes the "Clear Your Plate" campaign to stem food waste as new semester begins. (Xinhua/Ding Ting)