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The United Nations Framework Convention on Climate Change (UNFCCC) is an international treaty drawn at

  1. (a)United Nations’ Conference on the Human Environment, Stockholm, 1972
  2. (b)UN Conference on Environment and Development, Rio de Janeiro, 1992
  3. (c)World Summit on Sustainable Development, Johannesburg, 2002
  4. (d)UN Climate Change Conference, Copenhagen, 2009
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Official answer(b) UN Conference on Environment and Development, Rio de Janeiro, 1992