Updated: 47 min 39 sec ago
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.
India faces pressure to cut emissions even as its new prime minister is promising to boost energy access. Can a push for renewable energy achieve both goals?
Astronomers catch the blue light from a pulsar, a hurricane makes landfall, and an exoplanet sucks the life out of its star in the week's best space pictures.
The red planet beckons like never before, with a host of nations planning Mars missions.
U.S. aid to fight Ebola in West Africa could build trust in the health care system, helping to stop the epidemic and save the faltering economy.
The nation's farmers are 17 years older than the average American worker, with younger would-be farmers hobbled by rising costs of land and technology.
Rural areas, far-flung islands, and industrial cities the Yes side needed to win all voted to stay in the U.K.