Convention on biodiversity was held in ______?

Explanation

The Convention on Biological Diversity (CBD) was signed at the Earth Summit in Rio de Janeiro, Brazil on June 5, 1992.

The CBD was one of three conventions adopted at the Earth Summit, along with the UN Framework Convention on Climate Change and the Convention to Combat Desertification.

The CBD came into force on December 29, 1993, and has been ratified by almost 200 nations.