At the same time the human society have to strengthen international cooperation to solve such global problems as population, environment, resources and calamity.
与此同时，人类为了解决共同面临的人口、环境、资源、灾害等全球性问题，又必须加强国际间的合作。
Population, environment, economics research results tell us: the productivity of certain conditions, population growth and ecological environment should be the affordability of them.
人口环境经济学的研究成果告诉我们：在一定的生产力条件下，人口的增长应当与生态环境的承受力相适应。
Population, environment, economics research results tell us: the productivity of certain conditions, population growth and ecological environment should be the affordability of them.
人口环境经济学的研究成果告诉我们：在一定的生产力条件下，人口的增长应当与生态环境的承受力相适应。
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