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