The impact of climatic change on sustained agriculture in China is analysed according to the crop productivity and yield, cropping system, regional agricultural production and production cost.

并从农作物生产力和产量、种植制度、区域农业生产及生产费用等几方面分析了气候变化对中国持续农业的影响。

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The system is so complex that, to date, our best computer models are only crude approximations and are not sophisticated enough to test hypotheses about the causes of climatic change.

直至今日这个系统是如此复杂，我们最好的电脑模型也仅仅是粗略的近似指，而且它非成熟到足以检验气候改变原因的假说。

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