It has been determined by scientists that an extensive increase in sea level due to the melting of the Greenland ice sheet is inevitable, even in the event of immediate termination of burning fossil fuels that are fuelling the climate emergency.
Source: National Snow and Ice data Center
The research indicates that if global warming continues and emissions remain high, a multi-metre sea-level rise is probable due to the melting of ice caps, thermal expansion of the ocean as well as the loss of a minimun of 110tn tonnes of ice from Greenland alone - which would cause a sea-level rise of 27cm (10.6in).
Millions of people inhabit coastal regions, and flooding due to rising sea levels is amongst the most significant long-term ramifications of the climate emergency. Should Greenland's record meltdown year of 2012 become recurrent towards the end of this century, as has been predicted, then a "staggering" 78cm increase in sea-level can be expected from the ice cap, according to the experts.
Previous studies have employed computer models in an attempt to forecast future ice cap losses; yet, due to the intricate nature of these physical phenomena, their conclusions remain subject to a degree of uncertainty.
In contrast to other studies, this one published in Nature Climate Change used satellite measurements of ice losses from Greenland and the shape of the ice cap from 2000-19. This data was then analyzed to compute how far global heating had altered the equilibrium of snowfall and ice loss. This allowed scientists to outline how much further melting is required for balance to be achieved again.
Source: National Snow and Ice data Center
Prof Jason Box of Geus declared the figure to be a very conservative rock-bottom minimum, and predicted that it is likely to more than double within this century.
The 27cm estimate is just a start: it only takes into account already-observed global warming, and doesn't consider other mechanisms that contribute to the margin of the ice sheet's decrease.
This study gives a solid estimate of the sea-level rise that will take place, however, it does not cover how long it will take for the ice to melt. According to scientists' understanding, most of the rise will happen quickly. In 2021, other research warned that a large part of the Greenland ice sheet was on the edge of a turning point.
Source: National Snow and Ice data Center
Dr William Colgan, from Geus, has stated that we have already incurred a sea-level rise shortfall of at least 27cm – this will have to be made up regardless of what steps are taken in the future. Furthermore, he noted that due to our current climate trajectory, this figure is constantly expanding.
Colgan exclaimed that a normal year in 2012 would bring a committed loss of 78cm, which is astonishing. Already being in this range of ice loss is distressing. Yet there is still much to be done to lessen the harm by bringing into effect the Paris agreement; the impact of this could be immense.
Glaciers of the Himalayas and the Alps are projected to lose up to a third and half respectively, with the west Antarctic ice sheet possibly beyond a point from which it cannot recover. Oceans that have been heated expand, resulting in additional sea level increases.
Colgan observed that scientific literature indicates increasing backing for an increase in sea levels of many metres within the next century or two. Additionally, if swift climate action is implemented, collapse of the huge east Antarctic ice sheet, which has the potential to cause a 52-metre rise in levels over thousands of years if fully melted, may be prevented.
Prof Whiteman asserted the findings of this research cannot be ignored, particularly by business leaders and politicians who are concerned with mankind's fate. She noted it will have an adverse effect on the nearly six hundred million inhabitants of coastal areas which stand less than ten meters above sea level, as well as cause a loss of one trillion dollars in global wealth. Therefore, she emphasised the necessity for political entities to expeditiously enhance funding for both climate adaption and damage control.