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

The 1997 global conference on climate change was COP3, at which the Kyoto Protocol was adopted in Kyoto, Japan on 11 December 1997 [1]. That third Conference of the Parties produced the Kyoto Protocol — the world’s first treaty committing industrialized countries to quantified greenhouse‑gas emission reductions — and is commonly referred to as the Kyoto conference of 1997 [2]. Consequently, among the options given, Kyoto is the correct location for the 1997 global warming conference where the Kyoto Protocol was agreed.

Sources

1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 24: Climate Change Organizations > 24.2. KYOTO PROTOCOL: COp-3. > p. 324
2. [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 24: Climate Change Organizations > 1997 > p. 322