Nitrates poison water in California's Central Valley

In California's Central Valley, where verdant fields of fruit and vegetables unfurl under sunny skies, the water that feeds them—and flows into taps across the region—contains a toxic and silent poison.

Beijing issues rare air pollution alert

When the air gets really bad, Beijing says it has an emergency plan to yank half the city's cars off the road. The only problem is: It may be difficult to ever set that plan in motion.

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