Former Colorado nuke site opens to public as wildlife refuge

Cyclists and hikers explored a newly opened wildlife refuge at the site of a former nuclear weapons plant in Colorado on Saturday, while a protester in a gas mask brought signs warning about the dangers of plutonium.

Paris, Brussels call for car-free day in Europe

Europe should hold an annual car-free day in a bid to ease air pollution, the mayors of Paris and Brussels said Saturday on the eve of a vehicle-free day in their cities.

Optimism trumps despair at climate summit

Mayors, governors, entrepreneurs, CEOs, investors and celebrities delivered a double-edged message Friday at the close of a climate summit in San Francisco: global warming is making the planet unliveable—but we know how ...

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