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。

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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。

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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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