People paint on cloth bags during an activity calling for the protection of the Earth and the environment at a community in Haigang District of Qinhuangdao, north China's Hebei Province, April 21, 2020. Earth Day, which falls on April 22 annually, aims to raise public awareness about the environment and calls for people to protect the Earth with action. (Photo by Cao Jianxiong/Xinhua)

Students and their teacher show the clay works during an activity calling for the protection of the Earth and the environment at a community in Hefei, east China's Anhui Province, April 21, 2020. Earth Day, which falls on April 22 annually, aims to raise public awareness about the environment and calls for people to protect the Earth with action. (Photo by Ge Chuanhong/Xinhua)

Students and their teachers show a model of the Earth during an activity calling for the protection of the Earth and the environment in a school in Huzhou City, east China's Zhejiang Province, April 21, 2020. Earth Day, which falls on April 22 annually, aims to raise public awareness about the environment and calls for people to protect the Earth with action. (Photo by Tan Yunfeng/Xinhua)

Students display their paintings during an activity calling for the protection of the Earth and the environment at a school in Lianyungang City, east China's Jiangsu Province, April 21, 2020. Earth Day, which falls on April 22 annually, aims to raise public awareness about the environment and calls for people to protect the Earth with action. (Photo by Wang Jianmin/Xinhua)