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Blue-green algae is seen on the surface of Taihu Lake in this recent photo taken in Yixing, East China's Jiangsu Province. Outbreaks of blue-green algae, which sparked last year's water shortage crisis in Wuxi, Jiangsu Province, may hit Taihu Lake again this summer, say some scientists and top environmental officials.

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The words "SOS Taihu Lake", written using blue-green algae, are seen on the bank of the lake in this recent photo taken in Yixing, East China's Jiangsu Province. Outbreaks of blue-green algae, which sparked last year's water shortage crisis in Wuxi, Jiangsu Province, may hit Taihu Lake again this summer, say some scientists and top environmental officials.