What happens when the planet loses some of its ability to cool itself?
Since satellites began regularly measuring Arctic sea ice in 1979, it has declined sharply in extent and thickness.
A tree-climbing scientist takes the measure of a 3,200-year-old, 247-foot-tall sequoia.
When Sir Andrew Waugh, surveyor general of India, reported the measurements for Peak XV and declared it the highest mountain in the world, he proposed it be named after his predecessor, Sir George Everest.
Find out why you shouldn’t panic—at least, not yet.
Thirty years after the blast, Mount St. Helens is reborn again.
First printed 400 years ago, it molded the English language, buttressed the
Tease your brain with this geometric puzzle.
Read the Did You Know? feature from the Vesuvius feature article in the September 2007 issue of National Geographic magazine. In a.d. 79, the world's most dangerous volcano buried the town of Pompeii. The next blast could be much bigger. National Geographic Magazine Online, resource for research, updates, photography, global issues, geography, maps and multimedia.
Freshwater fish are dying. Scientists have a rescue plan.