Bringing extinct species back to life is no longer considered science fiction. But is it a good idea?

The mythical spot is now a boomtown, as two visions of the future compete for the soul of China’s western frontier.

A lofty idea is blossoming in cities around the world, where acres of potential green space lie overhead.

As rising temperatures melt the polar ice cap, five countries race to map their claims to a new energy frontier.

The biggest, deepest-diving, widest-ranging of all turtles, the leatherback has endured for 100 million years.

Green roofs turn the negative space of an arid roofscape into a positive—a collaboration with nature.

A local woman mends the fur jackets of Robert Peary’s team during an expedition to the North Pole.

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