The three largest glaciers in Greenland — which hold enough frozen water to lift global sea levels some 1.3 metres — could melt faster than even the worst-case warming predictions, research published Tuesday showed.

Until 2000, the main driver of sea level rise was melting glaciers and the expansion of ocean water as it warms.

But over the last two decades, the world's ice sheets atop Greenland and Antarctica have become the single largest source of sea level rise.

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A team of researchers based in Denmark and Britain used historical images and a host of other data to estimate how much ice had been lost from Greenland's Jakobshavn Isbrae, Kangerlussuaq Glacier and Helheim Glaciers in the 20th century.

They found that Jakobshavn Isbrae lost more than 1.5 trillion tonnes of ice between 1880-2012, while Kangerlussuaq and Helheim lost 1.4 trillion and 31 billion tonnes from 1900–2012, respectively.&nbsp;

The ice melt has already contributed more than eight millimetres to global sea levels, the researchers wrote.

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Shfaqat Abbas Khan, a researcher at the Technical University of Denmark, said using photographs taken before the satellite era was another tool to help recreate the last century's ice loss.

"Historical measurements over the 19th and 20th century may hide important information that can significantly improve our future projections," he told AFP.

The UN's climate science advisory panel, the IPCC, has forecast sea level rise from all sources of between 30-110 centimetres by 2100, depending on emissions.

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Under the IPCC's high emissions pathway, known as RCP8.5, nothing is done to curb carbon pollution throughout the 21st century, leading to a climate more than 3C hotter than pre-Industrial levels.

Models ran under RCP8.5 for the three glaciers featured in Tuesday's study predict a sea-level rise of 9.1–14.9mm by 2100.

But the paper, published in Nature Communications, pointed out that the high-emissions pathway temperature increase was more than four times larger than during the 20th century when the three glaciers already added 8mm to seas.

"The worst-case scenario is underestimated. Ice loss may be anywhere from three or four times larger than previous predicted for the thee glaciers considered in this study," said Khan.

A Nature study published in September found that if greenhouse gas emissions continued unabated, ice sheets in Greenland will shed some 36 trillion tonnes this century, enough to lift the global waterline some 10 centimetres.

The three largest glaciers in Greenland — which hold enough frozen water to lift global sea levels some 1.3 metres — could melt faster than even the worst-case warming predictions, research published Tuesday showed.

The three largest glaciers in Greenland — which hold enough frozen water to lift global sea levels some 1.3 metres — could melt faster than even the worst-case warming predictions, research published Tuesday showed. Until 2000, the main driver of sea level rise was melting glaciers and the expansion of ocean water as it warms. But over the last two decades, the world's ice sheets atop Greenland and Antarctica have become the single largest source of sea level rise. Also read| Coronavirus mutations appearing in Siberia: Russian scientists A team of researchers based in Denmark and Britain used historical images and a host of other data to estimate how much ice had been lost from Greenland's Jakobshavn Isbrae, Kangerlussuaq Glacier and Helheim Glaciers in the 20th century. They found that Jakobshavn Isbrae lost more than 1.5 trillion tonnes of ice between 1880-2012, while Kangerlussuaq and Helheim lost 1.4 trillion and 31 billion tonnes from 1900–2012, respectively. The ice melt has already contributed more than eight millimetres to global sea levels, the researchers wrote. Also read| Could listening to the deep sea help save it? Shfaqat Abbas Khan, a researcher at the Technical University of Denmark, said using photographs taken before the satellite era was another tool to help recreate the last century's ice loss. "Historical measurements over the 19th and 20th century may hide important information that can significantly improve our future projections," he told AFP. The UN's climate science advisory panel, the IPCC, has forecast sea level rise from all sources of between 30-110 centimetres by 2100, depending on emissions. Also read| Unusual 'electron' to reveal insight into dark matter, space-time mysteries Under the IPCC's high emissions pathway, known as RCP8.5, nothing is done to curb carbon pollution throughout the 21st century, leading to a climate more than 3C hotter than pre-Industrial levels. Models ran under RCP8.5 for the three glaciers featured in Tuesday's study predict a sea-level rise of 9.1–14.9mm by 2100. But the paper, published in Nature Communications, pointed out that the high-emissions pathway temperature increase was more than four times larger than during the 20th century when the three glaciers already added 8mm to seas. "The worst-case scenario is underestimated. Ice loss may be anywhere from three or four times larger than previous predicted for the thee glaciers considered in this study," said Khan. A Nature study published in September found that if greenhouse gas emissions continued unabated, ice sheets in Greenland will shed some 36 trillion tonnes this century, enough to lift the global waterline some 10 centimetres.

Greenland's largest glaciers likely to melt faster than feared: Study

In northeast Greenland, an occurrence has raised alarm bells of climate change as a large chunk of ice in the Arctic has broken away.&nbsp;

The chunk that is separated from Arctic's largest remaining ice shelf has a length of 11 sq kms and satellite images have shown that it is broken away into several small pieces.&nbsp;

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In picture:&nbsp;The&nbsp;section of the northeast Greenland ice shelf that has disintegrated over the last two years.

It strengthens the argument that climate change is rapidly impacting Greenland.&nbsp;

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Scientists on Monday said the vast and ancient ice sheet sitting atop Greenland had sloughed off a 113 square kilometer chunk of ice last month. The section of the Spalte Glacier at the northwest corner of the Arctic island had been cracking for several years before finally breaking free on August&nbsp;27, clearing the way inland ice loss to the sea, the Geological Survey of Denmark and Greenland&nbsp;reported.

"The atmosphere in this region has warmed by about 3C since 1980," said Dr Jenny Turton, as quoted by BBC News, adding that in 2019 and 2020, the summer temperatures were at record high levels.&nbsp;

Nioghalvfjerdsfjorden is about 80 km long and 20 km wide and at 79N, the glacier splits into two.

There is a minor offshoot that turns towards north, called Spalte Glacier that has now separated.&nbsp;

With climate change driving up Arctic temperatures, the once-solid sea ice cover has been shrinking to stark, new lows in recent years.

This year’s minimum, still a few days from being declared, is expected to be the second-lowest expanse in four decades of record-keeping. The record low of 3.41 million square kilometers,&nbsp;reached in September 2012 after a late-season cyclonic storm broke up the remaining ice – is not much below what we see today.

In northeast Greenland, an occurrence has raised alarm bells of climate change as a large chunk of ice in the Arctic has broken away. The chunk that is separated from Arctic's largest remaining ice shelf has a length of 11 sq kms and satellite images have shown that it is broken away into several small pieces.

In northeast Greenland, an occurrence has raised alarm bells of climate change as a large chunk of ice in the Arctic has broken away. The chunk that is separated from Arctic's largest remaining ice shelf has a length of 11 sq kms and satellite images have shown that it is broken away into several small pieces. In picture: The section of the northeast Greenland ice shelf that has disintegrated over the last two years. It strengthens the argument that climate change is rapidly impacting Greenland. Also read | Climate change contributes to spread of diseases through mosquitoes, says study Scientists on Monday said the vast and ancient ice sheet sitting atop Greenland had sloughed off a 113 square kilometer chunk of ice last month. The section of the Spalte Glacier at the northwest corner of the Arctic island had been cracking for several years before finally breaking free on August 27, clearing the way inland ice loss to the sea, the Geological Survey of Denmark and Greenland reported. "The atmosphere in this region has warmed by about 3C since 1980," said Dr Jenny Turton, as quoted by BBC News, adding that in 2019 and 2020, the summer temperatures were at record high levels. Nioghalvfjerdsfjorden is about 80 km long and 20 km wide and at 79N, the glacier splits into two. There is a minor offshoot that turns towards north, called Spalte Glacier that has now separated. With climate change driving up Arctic temperatures, the once-solid sea ice cover has been shrinking to stark, new lows in recent years. This year’s minimum, still a few days from being declared, is expected to be the second-lowest expanse in four decades of record-keeping. The record low of 3.41 million square kilometers, reached in September 2012 after a late-season cyclonic storm broke up the remaining ice – is not much below what we see today.

Climate change: Massive chunk of ice twice the size of Manhattan separated

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Greenland's largest glaciers likely to melt faster than feared: Study

Climate change: Massive chunk of ice twice the size of Manhattan separated