They are the Earth’s pollinators.

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<h3><font size="3">There will soon be seven billion people on the planet.

The Santa Clara Pueblo is among a growing number of tribes across the United States

Every time you drive to work, or worse yet, fly on a plane, the vehicle emits carbon dioxide that will stay in the atmosphere, warming the planet for thousands of years. Does it have to?

100 tigers, 2,000 one-horned rhinos, 1,800 wild buffalo?

The earthquake in Haiti was a reminder: Billions of people live in houses that can't stand shaking. Yet safer ones can be built cheaply

As Greenland returns to the warm climate that allowed Vikings to colonize it in the Middle Ages, its isolated and dependent people dream of greener fields and pastures

At first glance Greenland is an expanse of blinding white. But as my chopper swings low over the island, color catches my eye. For miles on end, bands of blue meltwater fringe the ice sheet. Fields of white are threaded with riv

There's no shortage of water on the blue planet

A source of conflict between Israel and its neighbors for decades, the Jordan River is now depleted by drought, pollution, and overuse. Could the fight to save it forge a path toward peace?