December 4, 2007 For more than 30 years, a group of doctors and their friends and family have made a long, bone-jarring and wet trip to a glacier in the center of Iceland. The tradition is part camping adventure, part scientific expedition, and increasingly bittersweet.
December 24, 2007 Many lakes formed by melting ice drain through passages called moulins, which carry water to the bedrock below the ice sheet that covers 80 percent of Greenland. The water under the ice sheet lubricates it, making it flow faster toward the sea.
March 17, 2008 The icy ocean around Antarctica is one of the most unspoiled in the world. It's world-renowned for its penguins, but one team of scientists is more concerned about the animals you can't see — and the fate these microscopic creatures may face in a warming world.
February 4, 2008 During the Ice Age, Joshua trees thrived across the American Southwest with the help of the ground sloth. The animals have been extinct for 13,000 years, and scientists predict that without the sloth's help, global warming will cause the desert tree to disappear, too.