Tag Archives: Ice sheet



Redwoods are the tallest living trees, often exceeding 300 ft (90 m) in height. Nearly exterminated by the ice sheets of the glacial ages, redwoods are found only in a narrow strip near the Pacific coast of the northwest US. They take up to 500 years to reach maturity, and some are known to be more than 1,500 years old. As redwoods age, their lower limbs fall away, leaving a columnar trunk that can reach a diameter of more than 20 ft (6 m). What is the largest tree in the world? More… Discuss

West Antarctic Ice Sheet Melt Past Point of No Return

West Antarctic Ice Sheet Melt Past Point of No Return

Experts say that a large section of the West Antarctic Ice Sheet has reached a state of irreversible retreat. Its continued melting will raise sea levels as much as 4 ft (1.2 m) over the next few hundred years and could trigger a chain reaction of additional melting of nearby parts of the ice sheet, causing sea levels to rise even more. Even if we were to curb our greenhouse gas emissions, we could not now reverse or even halt the melt. The best we could hope for is to slow the ice loss. More… Discuss

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Grand-er Canyon Discovered Under Greenland Ice Sheet

Hidden beneath the ice sheet that covers much ofGreenland is a vast canyon half a mile (800 m) deep and 470 miles (750 km) in length. By comparison, the Grand Canyon, though deeper, is just 217 miles (349 km) long. The hidden gorge, which has never been seen by human eyes, was discovered by chance as scientists researching climate change mapped Greenland’s bedrock. Now covered by an ice sheet that is 2 miles (3 km) thick at points and is so heavy it causes the entire island of Greenland to sag in the middle, the canyon was likely carved millions of years ago by an ancient river. More… Discuss