How European cities are getting cars off the road to combat air pollution - and meet the entrepreneurs embracing waste with taste.
China is gearing up to ban the sale of combustion-engine vehicles in a move that would have a huge impact on the global auto industry. Government officials added, though, there was no date yet for such a measure.
Microplastics aren't just fouling the world's oceans - invisible plastic fibers are polluting drinking water tapped by millions of people. Where do these fibers come from, and how bad are they for human health?
Flooded streets and destroyed homes are the immediate results of Harvey. But now, a toxic soup is threatening people and nature in a city known as the "oil capital of the world."
Illegal construction along Delhi's Yamuna River is rampant, eliminating floodplains. This leaves the city vulnerable to floods, and is affecting its groundwater levels.
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