With the increasing research on global resource and environment, studies on the transformation of natural resource-based cities have become a focus in the academia as a cosmopolitan problem.

随着全球资源环境问题研究的不断深入，资源型城市转型问题的研究成为一项世界性的研究课题。

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Estuarine sediment flux is not only one of contents of Global Change Research, but also is a practical problem nearly related to estuarine engineering and estuarine environment.

河口泥沙通量不仅是全球变化的研究内容，而且是与河口工程、环境等有密切联系的实际课题。

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The environment threat crosses over the boundaries of the region, nation, and race, constitutes the most typical global problem.

环境威胁跨越地区、国家、民族的界线，构成了一个最典型的全球性问题。

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At the core of the climate problem is the likelihood that future generations will pay with a deteriorating global environment for the refusal of current generations to live in balance with the atmosphere.

UNESCO: Climate change