Updated: 27 min 3 sec ago
In advance of this week's UN Climate Summit, National Geographic photographers were among those whose work was shown on the side of UN headquarters.
The U.S. CDC says Ebola outbreak could increase dramatically in the next four months without intense, immediate intervention.
The Islamic State's assault on a Kurdish area in Syria heightens tensions with Kurds in Turkey, but eases them between rival Kurdish factions in the Middle East.
UN Secretary-General Ban Ki-moon is urging more action from heads of state, while U.S. President Barack Obama defends American commitment to reducing emissions.
Most bird-watchers are white. If that can change, it would be in everyone's best interest.
Meet Worthy of Armor, Don't Fail, and Hot Flanks, ancient Scythian names for woman Amazon warriors, now revealed on Greek vases.
All five species of rhinoceros are threatened by poaching—but efforts like World Rhino Day are trying to bring attention to their plight.
Ahead of UN climate summit, Republican Bob Inglis says the idea would lower other taxes.
Pristine Seas effort ramps up partners, funding, and projects with an announcement at the Clinton Global Initiative.
Farewell, summer: The Northern Hemisphere's autumnal equinox—the first day of fall—occurs Monday, September 22.
Who emits the most carbon? Who should cut the most? As the UN prepares to convene its climate summit, new studies look at some surprising numbers.
The bruising independence campaigns opened up deep class and regional divisions in Scotland.
Marches took place in New York and in hundreds of other cities.
Learning of a refugee flood, photographer John Stanmeyer went to the border, where tens of thousands of refugees are fleeing the Islamic State.
Our mistakes are legion, but our talent is immeasurable, says award-winning author Diane Ackerman.
This week's global meeting in New York could set the stage for negotiations around a potential international deal next year.
As world population projections soar, there are rising concerns about the impact billions more people will have on the planet.
Federal officials weigh arguments on President Obama’s proposal to expand the Pacific Remote Islands Marine National Monument.
Flip through nine pictures of these marine mammals in honor of sea otter awareness week.
The fast-spreading King fire is raising concerns about climate change's role in making droughts more frequent and wildfires more intense.