By Passakorn Jumlongrach

Bangkok Post-Nov 26

More than 20 years ago, when two Chiang Rai-based environmentalists, Niwat Roikaew and Somkiat Kuenwongsa, learned that the Chinese government were blasting rapids in the upper Mekong River from Yunnan to Myanmar and Laos to clear the way for large commercial vessels, they started worrying.

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