Updated: 16 min 48 sec ago
Climate change isn’t the only concern of environmentalists opposing Keystone XL. Its path through the Great Plains crosses key wildlife migration routes and threatened species habitats.
Scientists have mounting evidence of centuries-long droughts in the West's distant past. They warn that Californians are now vulnerable to a drought that is measured in decades—or even hundreds of years.
Some of the Olympic athletes are voicing concerns about what they say are dangerous conditions.
In a paper published in the Lancet Oncology, doctors at Johns Hopkins offer ideas for making cancer care more affordable without increasing risk to patients.
Our photo editors picked their favorite shots of the latest winter storm to blast the East Coast.
A beetle collected by Charles Darwin 180 years ago was declared a new species on February 12, the 205th anniversary of his birth.
A sinkhole swallowed Corvettes in Kentucky. How did it happen? And where might other sinkholes occur?
Robots can build simple structures without a central plan.
Why are researchers and explorers still arguing over where the Amazon River starts?
Ocean temperatures, wind, and the weather pattern in the Pacific have contributed to the drought.
The oldest embryos of a dinosaur-era sea reptile show that ichthyosaurs gave birth on land, a surprising discovery.
At a London summit, world leaders and ministers demonstrate growing political will for action against wildlife crime.
A decorated breed, the wire fox terrier, takes top honors in a Westminster Kennel Club Dog Show that was marked by new entrants.
Early birds, and mammals, quickly sprouted a variety of colors more than 150 million years ago, a new study suggests.
Kirk Klancke has watched over the Fraser River for decades. "Education is what is going to save these rivers," he says.
A federal lab reports a new record for laser fusion energy.
DNA from a nearly 13,000-year-old infant confirm that the ancient Clovis people were descended from Asians.
Are zoos the conservation sanctuaries they claim to be? In Europe, only 13 percent of the species kept in its zoos are endangered.
Amid "salt shortages," officials protect roads against ice with rock salt, which is mined around the country.
President Obama unveils plan for curbing wildlife trafficking and combating organized crime in Africa.