Primary school students learn garbage sorting in Hefei, east China's Anhui Province, Sept. 2, 2019. An event was held on Monday at the school to raise children's awareness of garbage sorting and resource conservation. (Xinhua/Liu Junxi)

Primary school students learn garbage sorting in Hefei, east China's Anhui Province, Sept. 2, 2019. An event was held on Monday at the school to children's awareness of garbage sorting and resource conservation. (Xinhua/Liu Junxi)

Primary school students participate in a game of garbage sorting in Hefei, east China's Anhui Province, Sept. 2, 2019. An event was held on Monday at the school to raise children's awareness of garbage sorting and resource conservation. (Xinhua/Liu Junxi)

Students view handicrafts made by recycled material at Shangqiang primary school in Daixi Town in Huzhou, east China's Zhejiang Province, Sept. 2, 2019. (Xinhua/Weng Xinyang)

Students attend a lecture on waste classification at Shangqiang primary school in Daixi Town in Huzhou, east China's Zhejiang Province, Sept. 2, 2019. (Xinhua/Weng Xinyang)

Students attend a lecture on waste classification at Shangqiang primary school in Daixi Town in Huzhou, east China's Zhejiang Province, Sept. 2, 2019. (Xinhua/Weng Xinyang)

Students view handicrafts made by recycled material at Shangqiang primary school in Daixi Town in Huzhou, east China's Zhejiang Province, Sept. 2, 2019. (Xinhua/Weng Xinyang)

Students attend a lecture on waste classification at Shangqiang primary school in Daixi Town in Huzhou, east China's Zhejiang Province, Sept. 2, 2019. (Xinhua/Weng Xinyang)