World's Glaciers Melting Faster than Ever
2021-05-07
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1The world's glaciers are melting quickly.
2Scientists from the magazine Nature looked at 20 years of satellite data of the world's 220,000 mountain glaciers.
3They found that since 2015, glaciers have lost 298 billion metric tons of ice and snow per year.
4That is 31 percent more than 15 years ago, and enough ice melt to put Switzerland under 7.2 meters of water each year.
5Scientists say the melting is caused by climate change.
6They have long warned that warming temperatures are shrinking glaciers around the world.
7Romain Hugonnet studies glaciers at ETH Zurich and the University of Toulouse in France. He led the report.
8The thinning rate of glaciers is twice as high as it was 20 years ago, and "that's enormous," he said.
9Half of the world's glacier melt is in the United States and Canada.
10Alaska's melt rates are "among the highest on the planet," Hugonnet said.
11Alaska's Columbia Glacier is losing about 35 meters a year, he added.
12Almost all of the world's glaciers are melting.
13Even glaciers that used to be solid are now melting, such as ones in Tibet.
14The melting "mirrors" the worldwide increase in temperature and is from the burning of coal, oil and gas, Hugonnet said.
15Some smaller glaciers are totally lost.
16Two years ago, scientists, activists and government officials in Iceland even held a funeral for a small glacier.
17The study is the first to use satellite images to examine all of Earth's glaciers that are not connected to ice sheets in Greenland or the Antarctic.
18Past studies looked at just a small number of the world's glaciers.
19Shrinking glaciers are a problem for millions of people who use regular glacial melt for drinking water.
20Very fast melting can also cause deadly floods in places like India, Hugonnet said.
21But the biggest threat to the world is rising sea levels.
22The world's oceans are already rising from climate change because water expands when it gets warmer.
23Glaciers are responsible for 21 percent of sea level rise.
24Melting ice sheets in Greenland and Antarctica also cause sea level rise, but to a lesser amount.
25Mark Serreze is director of the American National Snow and Ice Data Center (NSIDC) in Colorado.
26He thinks "sea level rise is going to be a bigger and bigger problem as we move through the 21st century."
27The NSIDC was not involved in the study.
28Scientists said that it could take tens or even hundreds of years to regrow melted glaciers.
29Twila Moon studies glaciers at the NSIDC.
30She is not confident the glaciers can regrow, even if there is a worldwide reduction in emissions and the planet's temperature is controlled.
31"We're at a point where we're trying to keep as much ice as possible and slow that rate of loss," she said.
32I'm Bryan Lynn.
1The world's glaciers are melting quickly. 2Scientists from the magazine Nature looked at 20 years of satellite data of the world's 220,000 mountain glaciers. They found that since 2015, glaciers have lost 298 billion metric tons of ice and snow per year. That is 31 percent more than 15 years ago, and enough ice melt to put Switzerland under 7.2 meters of water each year. 3Scientists say the melting is caused by climate change. They have long warned that warming temperatures are shrinking glaciers around the world. 4Romain Hugonnet studies glaciers at ETH Zurich and the University of Toulouse in France. He led the report. The thinning rate of glaciers is twice as high as it was 20 years ago, and "that's enormous," he said. 5Half of the world's glacier melt is in the United States and Canada. 6Alaska's melt rates are "among the highest on the planet," Hugonnet said. Alaska's Columbia Glacier is losing about 35 meters a year, he added. 7Almost all of the world's glaciers are melting. Even glaciers that used to be solid are now melting, such as ones in Tibet. 8The melting "mirrors" the worldwide increase in temperature and is from the burning of coal, oil and gas, Hugonnet said. Some smaller glaciers are totally lost. Two years ago, scientists, activists and government officials in Iceland even held a funeral for a small glacier. 9The study is the first to use satellite images to examine all of Earth's glaciers that are not connected to ice sheets in Greenland or the Antarctic. Past studies looked at just a small number of the world's glaciers. 10Shrinking glaciers are a problem for millions of people who use regular glacial melt for drinking water. Very fast melting can also cause deadly floods in places like India, Hugonnet said. 11But the biggest threat to the world is rising sea levels. The world's oceans are already rising from climate change because water expands when it gets warmer. Glaciers are responsible for 21 percent of sea level rise. Melting ice sheets in Greenland and Antarctica also cause sea level rise, but to a lesser amount. 12Mark Serreze is director of the American National Snow and Ice Data Center (NSIDC) in Colorado. He thinks "sea level rise is going to be a bigger and bigger problem as we move through the 21st century." The NSIDC was not involved in the study. 13Scientists said that it could take tens or even hundreds of years to regrow melted glaciers. 14Twila Moon studies glaciers at the NSIDC. She is not confident the glaciers can regrow, even if there is a worldwide reduction in emissions and the planet's temperature is controlled. 15"We're at a point where we're trying to keep as much ice as possible and slow that rate of loss," she said. 16I'm Bryan Lynn. 17Seth Borenstein reported this story for the Associated Press and Cassandra Garrison reported it for Reuters. Dan Novak adapted it for VOA Learning English. Susan Shand was the editor. 18_________________________________________________________ 19Words in This Story 20glacier - n. a very large area of ice that moves slowly down a slope or valley or over a wide area of land 21enormous - adj. very great in size or amount 22mirror - v. to be very similar to (something) 23emission - n. the act of producing or sending out something (such as energy or gas) from a source