China's northern megacities face an acute water crisis — residents there have seventy-four times less fresh water than the average American. To address this imbalance, according to Live Science, the Chinese government has constructed the world's largest water diversion project, redirecting some of the planet's mightiest rivers thousands of miles to reach parched regions. The scale of engineering is staggering, but officials say there's still a more ambitious — and more dangerous — phase ahead.

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