Arctic temperatures to rise 3-5 degrees by 2050: UN

Even if the world were Even if the world were  to cut emissions in  line with the 2015 Paris Climate Change Agreement, winter temperatures in the Arctic would rise three to five degrees Celsius by 2050 and five to nine degrees by 2080, devastating the region and unleashing sea level rises worldwide, a new report by the UN Environment warned on Thursday.Rapidly thawing permafrost could even accelerate climate change further and derail efforts to meet the Paris Agreement’s long-term goal of limiting the rise in global temperature to two degrees Celsius, warns the report titled “Global Linkages — A graphic look at the changing Arctic”.By 2050, four million people and around 70 per cent of today’s Arctic infrastructure, will be threatened by thawing permafrost.Other environmental pressures on the Arctic identified by the paper, released at the ongoing United Nations Environment Assembly here that will conclude on Friday, include ocean acidification and plastic pollution.Even if global emissions were to halt overnight, winter temperatures in the Arctic would still increase four to five degrees Celsius by 2100 compared to the late 20th century, the study said.This increase is locked into the climate system by greenhouse gases already emitted and ocean heat storage.Arctic societies now must respond to climate change through suitable adaptation actions. Arctic Indigenous peoples already face increased food insecurity.From 1979 to the present, Arctic sea ice is estimated to have declined by 40 per cent.Climate models predict that, at the current rate of carbon dioxide emissions, Arctic summers will be ice-free by the 2030s.The melting of the Greenland ice cap and Arctic glaciers contribute to one-third of sea level rise worldwide.Even if the Paris Agreement is met, Arctic permafrost is expected to shrink 45 per cent compared to today.Globally, these frozen soils hold an estimated 1,672 billion metric tonnes of carbon.Increased thawing is expected to contribute significantly to carbon dioxide and methane emissions. (IANS)