A major Greenland glacier that was one of the fastest shrinking ice and snow masses on Earth is growing again, a new NASA study said. Around 2012, the Jakobshavn glacier was retreating about 1.8 miles and thinning nearly 130 feet annually. But it started growing again in the past two years, said a study in Nature Geoscience. A natural cyclical cooling of North Atlantic waters likely caused the reversal, said Ala Khazendar, a NASA glaciologist. Scientists think this reversal is temporary.
Clues into settlers of Canary Islands
Ancient DNA suggests that the Canary Islands’ earliest pioneers were North Africans who may have arrived around A.D. 100 or earlier, and settled on every island by at least A.D. 1000. The finding supports previous archaeological, anthropological and genetic studies indicating that the island’s first inhabitants were Berbers from North Africa. “This is the first ancient DNA study that includes archaeological remains from all the seven Canary Islands,” said Rosa Fregel, a population geneticist. Her team’s results, published in the journal PLOS One, undercut the idea that the islands’ early indigenous inhabitants were not explorers in their own right.