Plant a tree: Milan's ambitious plans to be cleaner, greener

If Italy's fashion capital has a predominant color, it is gray—not only because of the blocks of neoclassical stone buildings for which the city is celebrated, but also due to its often-gray sky, which traps pollution.

Paris bans old diesels to tackle pollution

Paris on Monday banned all diesel vehicles aged 13 years or over from the city centre, the latest move in a campaign to tackle pollution on the city's streets.

Mankind's messenger at the final frontier

It looks like a dustbin lid strapped to a cluster of fishing rods. Its computer is so puny it could not even start up your iPhone. And if E.T. wants to listen to the message it brings, he'll need a gramophone to play it on.

Arctic could be ice-free a decade earlier than thought

The Arctic Ocean's ice cap will disappear in summer as soon as the 2030s and a decade earlier than thought, no matter how aggressively humanity draws down the carbon pollution that drives global warming, scientists said Tuesday.

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