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In page Tan Kai:

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Tan became interested in environmental issues following April 2005's violent struggles over pollution and corruption in the town of Huashui, Zhejiang, where many residents believe that releases of toxic substances from chemical plants into the water supply are destroying crops and causing birth defects.[citation needed] Further riots in Dongyang, in Xinchang (over a pharmaceutical factory), and at a battery factory in Changxin, convinced Tan to set up an environmental monitoring group, which he did informally in the summer of that year, together with five other individuals: Mr. Lai Jinbiao, Mr. Gao Haibing, Mr. Wu Yuanming, Mr. Qi Huimin, and Mr. Yang Jianming.