ARio de Janeiro
BBrussels
CParis
DGeneva
Answer:
A. Rio de Janeiro
Read Explanation:
Global warming - International treaties
- It was the United Nations that took initiative to bring together the nations in its efforts to control climatic changes. 
- In 1992, the UNO approved the international guidelines regarding climatic change. - The same year, in the Earth Summit that took place at Rio de Janeiro the capital of Brazil, rules were laid out to the participating countries to control global warming. 
- When the consequences of global warming became more serious, the nations started blaming each other. 
- Since the Kyoto Summit failed, talks again started to protect the earth from the ill effects of global warming. 
- Following this the 15th World conference on Environment was held in Copenhagen, Denmark, This took place between 7th to 18th in December 2009 



