Thawing permafrost in the Arctic could create a dangerous ‘feedback’ in global warming by releasing greenhouse gases – adding £54 trillion to the cost of global warming.
The figure, revealed in a new Nature Research study, is due to the release of carbon dioxide and methane frozen in Arctic permafrost, which will amplify Earth’s warming.
The feedback mechanism (combined with the loss of heat-reflecting white ice) could increase global warming by 5%, the Guardian reports.
That would push the cost of global warming up to $70 trillion (£54 trillion) between now and 2300, according to the research published in Nature.
Researchers assessed frozen organic matter buried up to 10ft below the ice across the Arctic, and ran supercomputer simulations to assess the amounts released by different levels of warming.
‘It’s disheartening that we have this in front of us,’ said Dmitry Yumashev of Lancaster University.
‘Even at 1.5C to 2C, there are impacts and costs due to thawing permafrost. But they are considerably lower for these scenarios compared to business as usual.
‘We have the technology and policy instruments to limit the warming but we are not moving fast enough.’