In this July 19, 2011 photo, rows of pressure ridges stack up, foreground, before tumbling over the ever-collapsing calving 6-kilometer- (4-mile-) wide front of Jakobshavn Glacier and into the Ilulissat ice fjord, background, in Greenland. (AP Photo/Brennan Linsley) This story has been updated.
On Wednesday, NASA briefed the press on its “intensive research effort” into the rate and causes of sea level rise, releasing a suite of new graphics and visualizations showing how precisely the agency is measuring the upward creep of the oceans, currently at a rate of 3.21 millimeters per year.
A global map of tree density. Credit: Crowther, et al
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A new global census of all the trees on Earth estimates that more than 3 trillion call this "pale blue dot" home. But the total number of trees on the planet has dropped by almost 50 percent since human civilization began.
Washington (CNN)Former Alaska Gov. Sarah Palin took issue with President Barack Obama's visit to her state, saying he missed some key points while in the region.
There’s no doubt: it’s hot and weird out.Read more
Solar energy is ready for primetime. (Nicky Loh/Bloomberg)
In the 1980s, leading consultants were skeptical about cellular phones. McKinsey & Company noted that the handsets were heavy, batteries didn’t last long, coverage was patchy, and the cost per minute was exorbitant. It predicted that in 20 years the total market size would be about 900,000 units, and advised AT&T to pull out. McKinsey was wrong, of course. There were more than 100 million cellular phones in use in 2000; there are billions now. Costs have fallen so far that even the poor — all over world — can afford a cellular phone.Read more