Answer :
The Convention was opened for signing during the Rio Earth Summit on June 5, 1992, and went into effect on December 29, 1993. The US is the only UN member country that has not ratified the Convention.
Only four United Nations member nations are not Parties to the CBD: Andorra, South Sudan, the United States of America, and the Holy See (the Vatican). The Convention on Biological Diversity (CBD) is the international legal instrument for "the conservation of biological diversity, the sustainable use of its components and the fair and equitable sharing of the benefits arising out of the utilization of genetic resources" that has been ratified by 196 nations.
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