But as the world's population has grown, the unsustainable character of human behavior has become a global problem.
但随着世界人口的增长，人类行为的不可持续性特征已成为全球性的问题。
The use of various energy sources is the final problem stemming from human population growth.
源于人口增长的最终问题是如何使用不同的能源资源。
The problem of population and economy is one of the long term problems noticed by human society and is the most important research contents of population economics.
人口与经济问题是人类社会长期关注的问题之一，也是人口经济学最重要的研究内容。
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