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Greenland's massive ice sheets contain enough water to raise global sea levels by 23 feet, and a new study shows that they are melting at a rate "unprecedented" over centuries -- and likely thousands of years.The study, published Thursday in the scientific journal Nature, found that Greenland's ice loss accelerated rapidly in the past two decades after remaining relatively stable since the dawn of the Industrial Revolution in the mid-1800s.Today, Greenland's ice sheets are melting at a rate 50% higher than pre-industrial levels and 33% above 20th-century levels, the scientists found.Greenland's melting glaciers may someday flood your city"What we were able to show is that the melting that Greenland is experiencing today is really unprecedented and off the charts in the longer-term context," said Sarah Das, an associate scientist at the Woods Hole Oceanographic Institution and a co-author of the study.To determine just how fast Greenland's ice is retreating compared with the past, scientists used a drill the size of a traffic light pole to take ice core samples.The samples were taken from sites more than 6,000 feet above sea level, giving the researchers a window into melting on the ice sheet over the past several centuries.In the wake of October's dire report from the UN Intergovernmental Panel on Climate Change warning that civilization has just more than a decade to stave off climate catastrophe, Thursday's report spells more bad news for the planet, especially the millions of people living near the world's oceans.Melting from Greenland's ice sheet is the largest single driver of global sea level rise, which scientists predict could swamp coastal cities and settlements in the coming decades.Eight of the 10 largest cities in the world are near coasts, and 40% to 50% of the global population lives in coastal areas vulnerable to rising seas.The study also found that Greenland's ice loss is driven primarily by warmer summer air and that even small rises in temperature can trigger exponential increases in the ice's melt rate."As the atmosphere continues to warm, melting will outpace that warming and continue to accelerate," said Luke Trusel, an assistant professor at Rowan University and study co-author.According to Trusel, the current thought in the scientific community is that there is a temperature threshold that could trigger a point of no return for the eventual melting of Greenland and Antarctica's ice sheets. And though we don't know exactly what that temperature tipping point is, "what's clear is that the more we warm, the more ice melts.""Once the ice sheets reach these tipping points, it's thought that they'll go into a state of irreversible retreat, so they'll be responding to what we do now for centuries and milliennia into the future," Trusel said.What it's like at the ground zero of climate changeDas stressed that although climate science often focuses on the future impacts of warming, the findings show that the climate is already undergoing hugely significant changes."Climate change -- whether it's in Greenland or in your backyard -- is already here and already happening and already impacting people. It's not something that's coming in the future, and this study really drives home that point," she said.The-CNN-Wire? & ? 2018 Cable News Network, Inc., a Time Warner Company. All rights reserved. 3378

HESPERIA, Calif. (KGTV) - Snow and ice created dangerous conditions for Southern California drivers on the ‘White Christmas’ Tuesday morning. In San Diego County, drivers spun out on icy roads in higher elevations, including Sunrise Highway on Mount Laguna.On Interstate 15, dozens of cars piled up on the northbound lanes in the high desert city of Hesperia, Victor Valley News reported. Mobile phone video showed a man yelling for people to leave the road, followed by the sounds of crashing cars. "As soon as I hit the top of the hill, it was ice, black ice. I crashed and everyone else around me was crashing too," Brian Bolik told Victor Valley News. "A car behind us went over the embankment and rolled." Bolik said he and another off-duty EMT heard a woman screaming in the pileup, VVN reported."I knew I needed to pull her out of the situation because the cars were just coming and coming, and then diesel trucks were also coming fast and she couldn't get out," stated Bolik. "She had a broken leg. At the time I didn't think about getting hit by other cars, I just wanted to help the lady to safety," Bolik told VVN. At least 10 people were taken to the hospital, CHP officials reported. 1204

Heavy rain is forecast to continue falling in Pennsylvania and New York, with flood warnings in place Tuesday through Wednesday in some areas.Rising water levels over the weekend and Monday prompted evacuations and emergency declarations in Pennsylvania where water rescues included that of 215 girls on a rafting trip.Images posted to social media showed torrents of brown water sweeping through streets and under bridges.The worst flooding has been west of Philadelphia to Reading and Allentown, CNN meteorologist Michael Guy said, with the heaviest rain set to move farther north into New England Tuesday. 616

Goya CEO Robert Unanue claims that calls to boycott his brand prompted by his trip to the White House this summer actually boosted his company's sales.During an interview with conservative talk radio host Michael Berry on Monday, Unanue called Rep. Alexandria Ocasio-Cortez, one of the lawmakers who was critical of his trip to the White House, his "employee of the month.""She got employee of the month for bringing attention to Goya and our adobo," Unanue said.Unanue was referring to an Ocasio-Cortez tweet in which she implied she would begin making her own adobo sauce rather than buy Goya's. 605

Google has rolled out a new feature on its Maps app: traffic lights at intersections.Users on an Android and IOS will be able to see the traffic signals at crossroads throughout US cities, according to CNN.According to CNN, the traffic light features have been available in Japan for years.In August, Google unveiled a way for users to see on the app a way to identify easier terrain like beaches and forests with a "color-mapping algorithmic technique." It also has re-drawings of sidewalks and pedestrian islands for better navigation viewing. 553