World Environment Conference to discuss global warming was held in 1997 in

1. The question asks for the location of the World Environment Conference held in 1997 to discuss global warming. 2. The major international conference focusing on global warming and greenhouse gas emissions in 1997 was the third Conference of the Parties (COP 3) to the United Nations Framework Convention on Climate Change (UNFCCC). 3. This conference was held in Kyoto, Japan, from December 1 to 11, 1997. 4. It resulted in the adoption of the Kyoto Protocol. 5. Options analysis: (A) Stockholm hosted the 1972 UN Conference on the Human Environment. (B) Rio de Janeiro hosted the 1992 Earth Summit (UNCED). (C) Paris hosted COP 21 in 2015. 6. Therefore, the 1997 conference on global warming was held in Kyoto.