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Critically review the outcomes of the following international conferences:
(a) The Rio Earth Summit, United Nations Conference on the Environment and Development Rio de Janeiro, 1992;
(b) The Johannesburg Summit, the World Summit on Sustainable Development, Johannesburg 2002;
(c) The Rio + 20 United Nations Conference on Sustainable Development, Rio de Janeiro, 2012.
To what extent are these large international conferences are useful and effective means for enhancing international environment law?
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