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A revelation goes against widely held ideas about how some glaciers work, and it suggests that at least parts of Greenland's ice sheet survived periods of global warming intact.
Since the disastrous BP spill in 2010, environmentalists have kept watch over Louisiana's coastline. One consortium says there's far more oil leaking into the Gulf than companies are reporting.
Decision ostensibly due to Nebraska supreme court case
Project likely to be significant issue in November midterms
It looks as though the "comment period" for the controversial Keystone XL pipeline project will be extended, delaying a decision past the November elections.
Federal agencies are getting more time to review the controversial project, the State Department says, given an ongoing legal battle in Nebraska over whether the pipeline could pass through.
Dehydrating for Backpacking, a photo by mikey and wendy on Flickr.
Our next backpacking trip will be a 50 miler in the Gila Wilderness. I am dehydrating melons, berries and smoked tofu for the journey.
A government report says the land has been poisoned by heavy metals such as cadmium, nickel and arsenic, and concludes that the condition of China's soil offers "no optimism."
A hare on hind legs, technicolour savannahs and rare snow leopards are among the pick of this week's images from the natural world