Agricultural safety and health events caused by the heavy metal pollution often occur, it has become the most important factor of human health and the social stability.

由土壤重金属污染引发的农产品安全和人体健康事件也时有发生，成为影响人类健康和社会稳定的重要因素。

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In six of the seven, there was sufficient evidence to conclude that climate change caused by human activities played a factor in the events affecting their severity, likelihood or frequency.

CNN: Extreme weather and a changing climate