Answer: May 22
Notes: International Day for Biological Diversity (IDB) is observed every year on May 22 to raise awareness and take action to protect biodiversity. In 2025, the theme is “Harmony with Nature and Sustainable Development,” showing the link between biodiversity and the Sustainable Development Goals (SDGs). The theme also connects with the Kunming-Montreal Global Biodiversity Framework (KMGBF) and the recently adopted Pact for the Future. IDB was first established in 1993, and initially celebrated on December 29, marking the entry into force of the Convention on Biological Diversity. In 2000, the United Nations General Assembly (UNGA) changed the date to May 22, to mark the 1992 adoption of the convention in Nairobi.
