China’s Sino-Metals Leach Zambia spilled toxic sludge into communities and rivers, an accident that could cost billions to clean up and restore. The firm got impoverished and often illiterate villagers to sign away their right to sue in exchange for government-ordered payments ranging from $17 to $2,000.By Katie SurmaPlanet China: Sixth in a series about how Beijing’s trillion-dollar development plan is reshaping the globe—and the natural world.

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