What is the United Nations Environmeng Programme (UNEP) doing to support biodiversity? Inger Andersen, Under-Secretary-General of the United Nations and UNEP Executive Director, answers this and more in her 2021 video message for the International Day for Biological Diversity, which happens every 22nd of May.
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只有12％的城市，其空气质量符合世卫组织的标准。