People attend the San Francisco Earth Day Festival in San Francisco, the United States, April 21, 2024.(Photo: Xinhua)
People attend the San Francisco Earth Day Festival in San Francisco, the United States, April 21, 2024.(Photo: Xinhua)
People attend the San Francisco Earth Day Festival in San Francisco, the United States, April 21, 2024.(Photo: Xinhua)
A staff member (L) explains to a visitor (R) during the San Francisco Earth Day Festival in San Francisco, the United States, April 21, 2024.(Photo: Xinhua)