二十世纪是科学技术迅猛发展的世纪，人类改造自然的能力空前提高，社会生产力飞速发展，创造出巨大的社会财富。但同时我们也应该看到，这一系列成就是以生态环境的严重恶化为代价而取得的，因而有人把２０世纪称作“全球规模环境破坏的世纪”，生态环境问题已经成为世界关注 The twentieth century is a century of rapid development of science and technology. The ability of mankind to transform nature is unprecedentedly enhanced. The rapid development of social productive forces has created enormous social wealth. But at the same time, we should also see that this series of achievements have been made at the cost of a serious deterioration of the ecological environment. Some people have therefore called the 20th century “a century of environmental destruction on a global scale.” The issue of ecological environment has become the world’s concern