A volcano erupted violently in southwestern Colombia, spewing ash miles into the sky and prompting the evacuation of several thousand people.

Whale sharks are coming under pressure from overfishing and habitat degradation, putting the world's biggest fish in urgent need of protection, says biologist Zeb Hogan. Part of a series on National Geographic's Megafishes Project.

Park rangers in Belize are up against loggers and poachers in this segment from Wild Chronicles' Climate Connections series.

Australia is retrieving two anti-whaling activists held on a Japanese whaling ship they jumped aboard this week in Antarctic waters.

Not a sailboat and not a parachute—this German-built ship aims to save fuel by towing a kite to capture wind power high above the water.

An outbreak of hundreds of crown-of-thorns starfish is threatening a "global center of marine biodiversity" in Indonesia, surveys of the region reveal.

Saltwater from the encroaching ocean is contaminating already overextended—and dropping—water tables, the Chinese government says.

The six-story-tall plant recently discovered in Madagascar self-destructs by producing hundreds of thousands of flowers at once—a "truly spectacular" sight, says one scientist.

The Washington State volcano was steaming during two minor earthquakes this week, according to scientists who are giving St. Helens some space. "We're just being cautious," said one.

Some parasitic worms spread by transforming their ant hosts into "berries" that attract foraging birds, according to a new study.

Activists vow to continue chasing Japanese whalers, who have detained two of them as "hostages" or "pirates," depending on who you ask.

In just a decade, the rate of ice loss in western Antarctica and the Antarctic Peninsula has accelerated by 75 percent, a new study says.

Signs that winters are losing their bite have been abundant in recent years. Now researchers have the numbers to show just how big the changes have been.

Japanese whaling near Antarctica has been interrupted by the environmental group Greenpeace.

One of the world's most accomplished mountain climbers reflects on the life of a legend.