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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

HONG KONG — TikTok CEO Kevin Mayer has resigned amid U.S. pressure for its Chinese owner to sell the popular video app, which the White House says is a security risk. In a letter to employees seen Thursday, Mayer said that his decision to leave comes after the “political environment has sharply changed."His resignation comes after U.S. President Donald Trump ordered a ban on TikTok, unless parent company Bytedance sells its U.S. operations to an American company within 90 days. TikTok said in a statement that “We appreciate that the political dynamics of the last few months have significantly changed what the scope of Kevin’s role would be going forward, and fully respect his decision." 703

GRAND RAPIDS, Mich. -- A Grand Rapids teen is making sure your morning cup of coffee stays brewing for years to come with the launch of her new coffee line, Joven Coffee."Joven means 'young' in Spanish, so that is why we chose it because we're supporting young farmers," said Frankie Volekma, founder of Joven Coffee.At 14, Frankie is the youngest coffee Q grader in the world and is launching the coffee line to support the next generation of coffee farmers."We're just trying to make it a viable career option for a lot of these young farmers because a lot of times it's a low paying career to be in coffee farming," she said.In coffee producing countries like Columbia and regions of Africa, farmers are primarily 57 years old or older.Frankie's concern is those farmers will eventually retire, and there won't be enough young farmers to take their place."I think it's an important issue, and you're going to hear more about it over time," said Frankie's dad, Tim Volekma, owner of Sparrow Coffee and Schuil Coffee. "I feel like maybe we're one of the first people to sort of bringing it to bring light to this issue."As a young professional in the coffee industry, Frankie says she feels it is her calling to use her talents to support young farmers who may not have the same opportunities she does.She teamed up with young farmers in Columbia and a group of women farmers in Burundi in Africa and created two single-origin varieties under the Joven Coffee name."It's really cool for me to be able to be a part of something that is making an impact on the world," she said, "and even if it just helps a couple of farmers, that really makes me feel great about myself, and that I'm making a difference."Learn more about Joven CoffeeThis story was first reported by Savannah Fish at WXMI in Michigan. 1810

FULLERTON, Calif. (AP) — Police say a suspect has been arrested in the stabbing death of a man at the California State University, Fullerton campus.Fullerton police Lt. Jon Radus on Thursday told The Associated Press that 51-year-old Chuyen Vo was arrested Wednesday night at his home in Huntington Beach. Vo is suspected in the death of a former co-worker, 57-year-old Steven Shek Keung Chan. Police would not elaborate on the work relationship between the two men.Chan worked as the director of budget and finance and student services for university extended education but retired in 2017. He returned to the campus in January to work as a consultant.Authorities have said Chan was found stabbed numerous times inside his silver Infiniti in a campus parking lot on Monday, and they believe it was a targeted attack. 825

GOP Sen. Rand Paul was assaulted in his home in Bowling Green, Kentucky, on Friday, according to Kentucky State Police.State troopers responded to a call to the senator's residence at 3:21 p.m. Friday. Police arrested a man named Rene Albert Boucher, who they allege "intentionally assaulted" Paul, causing him "minor injury."Boucher, 59, of Bowling Green was charged with one count of fourth-degree assault. As of Saturday afternoon, he was being held in the Warren County Regional Jail on a ,000 bond.Police were not immediately clear on why Boucher allegedly assaulted Paul. The investigation is still ongoing, police spokesman Jeremy Hodges told CNN.Kelsey Cooper, Paul's Kentucky communications director, said in a statement: "Senator Paul was blindsided and the victim of an assault. The assailant was arrested and it is now a matter for the police. Senator Paul is fine." 888