1992, over fifteen hundred of the world’s scientist, including more than half of living Nobel Prize winners have signed a document which expressed their concerns about the condition of the biosphere. There is a struggle between nature and human being. Human’s activities are against natural environment. Our activities have caused a great damage to the biosphere. These activities are dangerous for human society, Plant and animal kingdoms, Such activities should be checked. America and England both agreed that the future of our earth is uncertain. We can have sustainable development of nature. There are greater changes of contracting cancer, emphysema or asthma, lack of hearing loaf sperm, scarcity of food etc.
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