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Although climate change has become a common concern of the international community, the developed and developing countries bear responsibility for emissions reductions is still considerable differences cause the two sides have not reached the mandatory binding global emissions reduction agreement. Therefore, in order to protect the international competitiveness of the domestic industry to prevent carbon leakage, and force developing countries to make a mandatory binding emission reduction commitments, such as the United States, the European Union also have passed contains the terms of the \in countries that \Expand \First, in the introduction, a brief introduction to the historical background of the Europe and the United States and other countries impose a \Then, in the first chapter, on the basis set forth in the narrow and broad \specific performance may be in the form of tariffs in the traditional sense, it could be domestic taxes, quotas and other. Shortly thereafter, in the second chapter, focusing on the analysis of the four major European countries and the United States impose a \considerations; also pointed out that the nature of these policy considerations are in order to ensure that the national political and economic interests, environmental protection is not its main purpose. Then, in the third chapter, the combined GATT1994 related provisions and jurisprudence, analyze GATT1994 1,2,3,11,13 and 20 \possible violation of the provisions of section 2, 11 and 13; also pointed out that when quoted GATT1994 20 seeking an exemption, \requirements may meet the requirements of Section 20 (g) of paragraph, however, further evidence of \Finally, in the conclusion, the paper argues that, in order to cope with climate change, under existing WTO rules, each member of the party still enjoys a certain policy space to take unilateral measures, and the unilateral measures does not necessarily constitute the WTO violation of existing rules, but these policies depends on the specific design and detailed implementation.
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