A man participates in a strike to call attention to climate change in New York, the United States, on Sept. 20, 2019. (Xinhua/Li Muzi)

A cardboard with slogans is seen in a strike to call attention to climate change in New York, the United States, on Sept. 20, 2019. (Xinhua/Li Muzi)

People participate in a strike to call attention to climate change in New York, the United States, on Sept. 20, 2019. (Xinhua/Li Muzi)

A man participates in a strike to call attention to climate change in New York, the United States, on Sept. 20, 2019. (Xinhua/Li Muzi)

People participate in a strike to call attention to climate change in New York, the United States, on Sept. 20, 2019. (Xinhua/Li Muzi)

A woman participates in a strike to call attention to climate change in New York, the United States, on Sept. 20, 2019. (Xinhua/Li Muzi)