Paris global warming targets could be exceeded sooner than expected because of melting permafrost, study finds

Authored by independent.co.uk and submitted by Wagamaga
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The world is on course to exceed global warming limits set out in the Paris climate agreement much earlier than previously thought, scientists have warned, following the first comprehensive study of the impact of melting permafrost.

Experts said dangerous climate change was almost “inevitable” and the planet was on the brink of a “tipping point” as thawing permafrost releases large volumes of carbon dioxide and methane into the atmosphere, causing temperatures to rise and more permafrost to melt.

They warned that governments were engaged in “wishful thinking” when it came to emission reductions and said their study showed previous warming projections that failed to account for permafrost thaws may be inaccurate.

Permafrost – soil that has been frozen for at least two years – acts as a store for large amounts of carbon and other nutrients from organic matter.

However, governments have largely failed to factor the release of vast amounts of carbon held in this frozen rock and sediment into their climate projections.

Researchers at the International Institute for Applied Systems Analysis, who studied the impact of thawing permafrost on emissions targets, said policymakers had made assumptions about climate change based on a “linear relationship” between global temperature rise and CO2 emissions.

They found that the release of huge amounts of carbon would render past emissions projections useless as they fail to account for the exponential growth triggered by melting permafrost.

Lead author Thomas Gasser said his study was the first time such a tipping process was adequately accounted for in emission budgets.

According to the researchers, doing so shows that the world is closer to exceeding the budget for the long-term target of the Paris Agreement than previously thought.

“The scientific answer to ‘how soon are we likely to exceed our Paris target’ is somewhere between 10 years ago and the next 20 years. Definitely not later than that,” he told The Independent.

“We should have changed course a while ago, and we should now significantly increase our efforts to do so.”

He added: “Permafrost carbon release from previously frozen organic matter is caused by global warming, and will certainly diminish the budget of CO2 we can emit while staying below a certain level of global warming.

“It is also an irreversible process over the course of a few centuries, and may therefore be considered a ‘tipping’ element of the Earth's carbon-climate system that puts the linear approximation of the emission budget framework to the test."

The Paris Agreement commits signatories to limit global warming to no more than 2C above pre-industrial temperatures – with a further aim of keeping the increase to 1.5C – by the end of the century.

The deal acknowledges that the 1.5C target will initially be exceeded, peaking at “well below” 2C and then pursuing efforts to get back to 1.5C.

However Mr Gasser described that approach as the "lazy solution” and warned it relied on “hypothetical technology, and a lot of wishful thinking”.

He said: "Overshooting is a risky strategy and getting back to lower levels after an overshoot will be extremely difficult.

“However, since we are officially on an overshooting trajectory, we have to prepare ourselves for the possibility that we may never get back to safer levels of warming.”

Commenting on the study, Bob Ward, policy director at the London-based Grantham Research Institute on Climate Change, said: “This important study shows how dangerous it could be for the world to trigger the tipping point beyond which thawing permafrost releases large volumes of carbon dioxide and methane into the atmosphere.

“If this happens, it could become inevitable that we suffer dangerous climate change. That is why it is so vital that global emissions of carbon dioxide and other greenhouse gases from human activities are cut strongly and urgently to limit the amount of further global warming and avoid reaching such a disastrous tipping point.”

The research was published in the journal Nature Geoscience.

GeoResearchRedditor on September 18th, 2018 at 03:09 UTC »

While everyone seems to be giving up and resigning themselves to nihilism, there are some of us who are putting in time and effort to find a way to fix the mistakes of those officials who choose to not effectively act in light of Climate change.

I am only one person but right now I am putting my days toward my PhD, studying Environmental mapping and monitoring of important water ecosystems so that we can keep these system secured for the future ensuring us a better chance at surviving this mess.

I'm not a particularly smart guy, I do this knowing fully well that I am just one person and the challenge is real. I don't do this because I want to, I would rather be playing video games all day.

But someone has to do it and anyone CAN do something to help. It doesn't even have to be something that demands your time. Just don't eat beef and you'll be doing something (given that cattle farming contributes ridiculous amounts of greenhouse gases).

To resign yourself to destruction is a cowardly choice. Pull your head out of your ass and make the decision to change yourself in some, even minor way to help offset this. If you do, it really helps make things easier for those of us who are actively trying to fight this with research and science.

But if you don't; it's hard to say if we'll be able to manage this when the solution comes together.

LubbockGuy95 on September 18th, 2018 at 02:52 UTC »

The fact that all their car manufactures lie about their pollution rate and threaten and bully governments who bring this up is not helping in any way.

kwest84 on September 18th, 2018 at 00:29 UTC »

I know I've read it somewhere before, but could someone remind me of what the consequences of going above 2, 3, and 4 degrees would be? And when would human life on earth become truly threatened?

Edit for visibility, I think this link answers my question: http://globalwarming.berrens.nl/globalwarming.htm