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.
Eight months after the disasters of March 11, photographer David Guttenfelder returned as the only non-Japanese photographer to shoot the damage at the Dai-ichi Nuclear power plant. This is what he saw.
A tree-climbing scientist takes the measure of a 3,200-year-old, 247-foot-tall sequoia.
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
In his award-winning film, photographer Pete McBride follows Jonathan Waterman's attempt to paddle down the Colorado River from source to sea, with surprising results.
A crisis is looming: To feed our growing population, we’ll need to double food production. Yet crop yields aren’t increasing fast enough, and climate change and new diseases threaten the limited varieties we’ve come to depend on for food. Luckily we still have the seeds and breeds to ensure our future food supply—but we must take steps to save them.
Thousands of Mexican riders make the yearly journey to Guanajuato's 65-foot-tall statue of Cristo Rey, Christ the King.