A second leak at the Shell oil platform in the North Sea is proving harder to stop than the first.

A Chinese protest against a chemical factory was one of the largest in three years — at least 12,000 people — and may herald a shift towards more public action in the country.

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Philadelphia Mayor Michael Nutter is exchanging ideas with leaders in Rio about greening their cities.

How our tricksy brains are keeping us from drinking cleaned wastewater: "It is quite difficult to get the cognitive sewage out of the water, even after the real sewage is gone," says one psychologist.

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Everything you ever wanted to know about beaches, and more.