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Abstract
Today the issue of environment is the most vital and burning issue in contemporary world because whole world has been facing severe crisis of environmental degradation. Therefore, customary law and general principles relating to the environment, such as the 'precautionary principle' and sustainable development, are evolving but it is arguable whether any have yet become normative rules. The speed with which awareness of global environmental problems has reached the international political agenda has meant that customary law has tended to take second place to treaty law in the evolution of legal norms, and treaties have been the main method by which the international community has responded to the need to regulate activities which threaten the environment. There are hundreds of bilateral and multilateral environmental treaties creating states' rights and obligations.