The complex natural climate cycle has given the freshwater nesting grounds running through this area complex changes between wet and dry.

复杂的自然气候循环赋予了这个区域内相通的淡水栖息地复杂的干湿变化。

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Antonio Nobre of Brazil's National Institute for Research in the Amazon says signs of a destructive climate cycle are already detectable.

巴西国家亚马逊研究所的安东尼奥·诺布雷称：破坏性的气候循环已经初露端倪。

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Chen li says, Harbin city appears this year "before the winter is warm" phenomenon, with in recent years our country is in slant warm climate cycle is concerned.

陈莉说，哈尔滨市今年出现“前冬暖”现象，与近年来我国处于偏暖气候周期有关。

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Skeptics say global warming is part of a natural cycle of climate change.

VOA: standard.2009.12.09

Models have typically attributed half of the loss of ice to greenhouse gases and half to natural variations in the climate cycle.

CNN: Arctic melt worse than predictions

Science plays an important role in our response to global issues such as climate change, the hydrological cycle, biodiversity loss, natural hazards and human-induced disasters, population growth, land-use change, migration and urbanisation.

UNESCO: UK National Commission for UNESCO :: Environmental Science

Climate change is expected to modify the hydrological cycle and affect freshwater resources.

UNESCO: Social and Human Sciences