In January 1992, more than 200 heads of states met in Rio de Janeiro in Brazil, for the first International Earth Summit. 

Answer:

In June 1992, more than 100 heads of states met in  Rio de Janeiro in Brazil, for the first International Earth Summit. 

Explanation

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.