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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

HAWTHORNE, Calif. (AP) — Billionaire Elon Musk says he's almost completed a tunnel under a Los Angeles suburb to test a novel transportation system that would scoot commuters underground on electric sleds called skates.Musk tweeted Thursday that, pending regulatory approvals, free rides will be offered to the public in a few months. He also posted an Instagram video of the interior of the tunnel.Last year, the Hawthorne City Council approved an approximately 2-mile (3.2-kilometer) test tunnel from Musk's SpaceX rocket plant to a point east of Los Angeles International Airport.RELATED: Elon Musk releases plan for tunnel system under Los AngelesMusk has described a system in which vehicles would descend via elevators into tunnels and move on electrically powered platforms called skates. He envisions multiple levels of tunnels to escape congestion that plagues surface traffic systems."As mentioned in prior posts, once fully operational (demo system rides will be free), the system will always give priority to pods for pedestrians & cyclists for less than the cost of a bus ticket," Musk tweeted.Musk's tunneling operation, called The Boring Co., is currently seeking approval to push into the city of Los Angeles, which requires separate authorization. So far, a committee of the City Council has agreed that the project should be exempt from environmental review.RELATED: What happened to the Tesla that Elon Musk shot into space?Musk suddenly added tunneling ideas to his SpaceX rocketry and Tesla electric car endeavors more than a year ago.A few weeks after tweeting "Traffic is driving me nuts" and "am going to build a tunnel boring machine and just start digging," he said in January 2017 that tunnel was about to get underway. He acquired a tunnel-boring machine that had been used in a San Francisco Bay Area project and put it down a shaft in a parking lot at the SpaceX facility in Hawthorne.He has also tweeted about a vision for a tunnel that would stretch along the Interstate 405 corridor from LAX to U.S. Highway 101 in the San Fernando Valley, a span of about 17 miles (27 kilometers). It's among the most notorious examples of what Musk has called "soul-destroying" Los Angeles traffic. 2238

Have you ever poured yourself a drink and browsed online, only to find a package at your door days later? Well, you’re not alone, according to a new survey.According to the personal finance website Finder.com, nearly half of Americans surveyed earlier this year said they’d made a purchase while under the influence.The survey found the average American spent 7.57 while drunk shopping. That total is up from the 2017 average, which was about half of that amount.So, what are drunk shoppers buying? Besides food, the top items are shoes and clothes.The survey found a quarter of people also like to gamble while drunk.The good news—there are apps that can stop you from drunk shopping. Crome browser extensions like Focus Me and Freedom allow users to block certain websites for a certain amount of time. The apps also allow you to set a spending limit, so you don’t wake up with a financial hangover.   919

HOLLISTER, Calif. (AP) — A magnitude-4.7 earthquake has struck a wilderness area of central California.The U.S. Geological Survey says the temblor occurred at 12:42 p.m. Tuesday and was centered about 16 miles (25 kilometers) southeast of Hollister. The quake occurred at a depth of 6 miles (9.6 kilometers).The epicenter area is in a rugged mountain range, with agricultural areas to the west.Late Monday, the San Francisco Bay Area was rattled by a magnitude 4.5 earthquake.That quake was center near Pleasant Hill, northeast of Oakland but was felt widely.More than 67,000 people posted to the U.S. Geological Survey's citizen reporting web page.Veteran seismologist Lucy Jones says the two quakes are too far apart to be related. 741

GREENCASTLE, Indiana — Protesters at DePauw University in Indiana interrupted a press conference meant to discuss recent racist writings on and near campus, one day after students demonstrated at an on-campus event led by actress Jenna Fischer. After five incidents of racial slurs were written across campus in the last two weeks, protesters interrupted actress Jenna Fischer's talk Tuesday night. On Wednesday, university officials held a press conference to discuss the incidents and Tuesday's protest. About 10 minutes into the press conference Wednesday, DePauw President Mark McCoy learned about protesters outside the doors, wanting inside. McCoy and the other officials allowed the protesters inside, where they chanted, "Meet our demands. We are not safe." For about 20 more minutes, McCoy and the group discussed the incidents, and what the university is doing to stop future incidents from happening. "We are all together addressing every issue that has happened on this campus," McCoy said. "We are committed to addressing these issues. DePauw has made so many efforts to address this and has still fallen short."McCoy eventually became visibly frustrated by the interruptions from the crowd.Fischer was on DePauw's campus to promote her book, "The Actor's Life: A Survival Guide."Watch the full press conference, protest and discussion in the video below. Warning: Profanity 1465