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Pessimists think: too much in today's world population, environmental damage is very serious and can not recover in the short term, the level of technological development of a chance to fill the growing population. Therefore the world's population has exceeded the capacity of the Earth's environment and population, the global population number 3 is still growing, the disaster was inevitable. Optimists believe: science and technology, number 3 there are many unexplored human Moreover, governments have strengthened cooperation on environmental issues, raise environmental number 3 awareness in the population growth number 3 rate under control. Thus the future of humanity will have enough power to achieve sustainable development, the total population growth number 3 will not limit the capacity of the population to reach the Earth's environment. Neutral considered: humans through number 3 their own efforts, number 3 their ability number 3 to maintain coordinated development and ecological environment in the future development, but it is necessary capacity of the Earth's population on the environment an approximate upper limit setting. Report of the United Nations Conference on Human Environment in 1972 on the publication of the view that the global population will stabilize at around 11 billion, can maintain a reasonable and healthy human life on Earth.
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