By Agence France-Presse
Experts said that even modest temperature increases adopted in the framework of an international plan to limit the climate catastrophe could see that the glaciers of this century are sufficiently melted to be "irreversible".
The Paris Treaty of 2015 raises the temperature levels of its nations to two degrees Celsius (3.6 degrees Fahrenheit) above pre-industrial levels and, if possible, to less than 1.5 ° C.
This ball park, which reached a temperature of 1.5-2C until 2100, is the best scenario achieved by consuming natural resources and burning fossil fuels, and will require radical, global lifestyle changes.
By comparison, the usual business approach of people – if we continue to spread greenhouse gases at the present rate – we will see the world's heat up to 4C.
Scientists had known for decades that the ice sheets of Greenland and Antarctica were shrinking, but they were supposed to be freed from a relatively high temperature rise of 1.5-2C.
However, according to a new analysis published in Nature Climate Change, even modest global warming can cause irreversible damage to the polar ice by contributing to the increase of polar sea level.
Frank Pattyn, head of the geology faculty at the University of Free University, told AFP that, 1.5-2C is closer to the limit where more dramatic impacts can be expected from the ice sheets.
His team drew data on annual temperature increases, ice sheet coverage, and known melt levels, and saw that the Greenland and Antarctic ice sheets could reach a bilinen tipping point eri around 2C.
As The presence of a tipping point implies that ice sheet changes are potentially irreversible – the return to an pre-industrial climate may not stabilize the ice sheet after the tipping point has passed, Patt Pattyn said.
This is the tipping point of this century This
The ice found in Greenland and Antarctica contains enough frozen water to raise the global sea level by a few meters.
The Greenland ice sheet alone contributed to the global sea level by 0.7 millimeters each year since the mid-1990s.
And the poles are warming faster than other places on earth, Greenland is only 5C warmer in winter and 2C warmer in summer.
Scientists, even with large global temperature increases, may predict that it will last hundreds of years to dissolve, but Monday's work makes the interest in realistic planning to prevent humanity from heating in one go.
Many models of the 1.5-2C scenario allow the threshold to be violated in the short term, potentially allowing the planet to warm up a few degrees higher before using it to bring back carbon capture and other technologies by 2100.
The study, however, warned against this approach, but said that a feedback loop caused by higher temperatures would "cause the entire ice layer to self-melt, even if these increases were later compensated."
For Greenland, the team said that 95 percent of the time, the decline of the large ice sheet would take place at 1.8C heating.
. It is known that there are tipping points for both Greenland and Antarctica for the warming levels that can be reached before the end of this century, Patt Pattyn said.