The date December 29th is significant as it is the date when the Convention on Biological Diversity (CBD) entered into force in 1993. While the official International Day for Biological Diversity celebrated by the United Nations is on May 22nd (commemorating the adoption of the text of the Convention on 22 May 1992), December 29th is also recognized by some as a Biodiversity Day, specifically related to the coming into effect of the foundational treaty. Given the options provided, December 29th is the only date directly linked to a key event concerning the Convention on Biological Diversity.