Updated: 38 min 29 sec ago
A new study says global warming will lead to more extreme swings of the El Niño-La Niña cycle.
Io, Jupiter's vanishing moon, and Neptune, the solar system's most distant planet, challenge stargazers this week.
President Obama's proposal to designate 12.3 million acres of oil-rich land as new wilderness in the Arctic National Wildlife Refuge is likely to stir an explosive federal debate over energy and conservation.
Mud hens, boll weevils, and banana slugs make for unlikely team symbols—but they're all tough in their own way.
The theory is central to life on Earth, says the Science Guy, and helps explain our place in the universe.
From sugarcane farmers in Mozambique to fishermen on the Philippines's Sulu Sea, here's a collection of some of the best photographs from our Future of Food series.
Infections typically get carried to the U.S. by people who catch them in other countries, and then the disease spreads. Investigators don't yet know who started the recent outbreak in California.
Thousands of dead auklets are washing ashore from California to Canada. Will other species be next?
Stars careen across the Himalaya, scientists search for an afterglow, and a cyclone kicks up a fuss in this week's best space pictures.
Only the second case of cannibalistic hippos has been recorded in South Africa-but they're not the only animals that eat their own kind.
Look! Up in the sky! An asteroid will be zipping by Earth soon, no threat but a treat for stargazers.
National Geographic maps have charted every mountain, river, lake, road, reef, fjord, island, inlet, glacier, ocean, planet, galaxy, and solar system.
Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) has clear limits, says Secretary General John Scanlon.
For the first time in two decades, the nation is expanding its oil leases even as prices plunge.
New rhino poaching numbers from South Africa frustrate conservationists, who have been battling illegal hunting for years.
The energy used to produce wasted food generates more than 3.3 billion metric tons of carbon dioxide.
The hand bones of early human ancestors, compared with those of apes and modern people, point the finger at surprisingly early stone tool use.
The spacecraft sends home new views as it rides along with a comet toward the sun.
A rarely seen frilled shark was caught by fishers off the coast of Australia.
A baby bird that resembles a toxic caterpillar is among several animals that masquerade as other species to trick predators.