A staff member introduces butterflies on display for visitors during the 7th World Conservation Congress in Marseille, southern France, on Sept. 3, 2021. Hosted by the International Union for Conservation of Nature (IUCN) and France, the 7th World Conservation Congress (WCC) kicked off here on Friday, aimed at driving action on the most pressing environmental issues, including biodiversity, climate change and recovery from the COVID-19 pandemic. (Xinhua/Gao Jing)
