Updated: 1 min 51 sec ago
Gina McCarthy, EPA chief, talks about Earth Day and how it became a global environmental event that on April 22 will include a billion people.
Sange Sherpa lost a son on Everest. But for many climbers, he says, the risk is worth it.
Abdel Kader Haidara had made it his life's work to document, as never before, Mali's achievements as an ancient center of progressive thought. When the jihadists came, he led the rescue operation to save 350,000 manuscripts.
The remains of Sherpa guides killed by an avalanche on Mount Everest on Friday, the deadliest day in the mountain's history, have been cremated.
In the wake of a deadly avalanche on Mount Everest, Sherpas ask for concerns to be addressed.
In her new book, Ingrid D. Rowland explains of abiding allure of Pompeii over the centuries and laments the effects of neglect and the weather.
The coming weeks could determine whether tens of thousands will die in the world's newest country.
An experienced Everest climber assesses the impact of the deadly avalanche on climbers and the Sherpas who assist high-altitude expeditions.
The tragedy on Everest recalls the highs and lows of the long history of climbing the mountain.
Extending the wait for a verdict on the controversial Keystone XL pipeline, the U.S. State Department says it will allow more time for federal agencies to weigh in.
Jesus has been born and born again over the course of American history.
Sherpas see climbing dangerous peaks as a path to prosperity.
Emmanuel de Merode, chief warden of Virunga National Park, is recovering from gunshot wounds suffered in an attack Tuesday.
Nat Geo photographer Aaron Huey documents Sherpa villages and shares perspective on the April 18 Everest avalanche.
The Mount Everest climbing season has begun with tragedy.
Soaring population growth in Egypt threatens historical buildings, monuments, and artifacts.
On the deadliest day of Mount Everest's history, learn about the Sherpas and their crucial role in mountaineering.
The ancient town destroyed by Vesuvius is undergoing renewed rescue efforts.
A galaxy warps, auroras light up the night, and the moon turns blood red in this look back at the week in space.
U.S. undercover investigation nets an alleged rhino horn trafficker with ties to former Medellín drug cartel.