In fact, environmental issues often are not restricted within the geographical boundaries of one country, but it will affect more than one country. Type of externality that is exported from the country of origin, including the urgent problems, such as acid rain. Global warming and water pollution, and loss of biodiversity can move across borders without restriction. Plain cross-border pollution problems pose a challenge for khai due to special features that vary from environmental problems in the country. In case of problems, more than one country? No international political power with the ability to intervene and enforce cooperation is still not effective. In cases where there is no control action together is difficult to resolve the problem. Again, both inequality between countries, in particular when the potential damage caused by external effects will not be balanced.
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