James Hansen’s new climate bomb: Are today’s greenhouse gas levels enough to raise sea levels by 60+ metres?

By David Spratt

Prof. James Hansen is sometimes affectionately referred to as the ”godfather” of modern climate science, so when he drops a bomb, there is bound to be shock and awe.  

And that’s what has happened with the recent release by Hansen and his colleagues of a draft of a new paper which finds that the climate is much more sensitive to increases in greenhouse gas that generally thought. This new analysis means that the current level of greenhouse gases, if maintained, would be enough in the longer term to melt all ice sheets and push up sea-levels by more than 60 metres.

Why markets fail on fossil fuel pollution, heralding an era of climate disruption

For more than 30 years, policy-makers have believed, and relied on, market mechanisms to respond to rapidly rising fossil fuel emissions and a heating planet. They have failed, and an era of climate disruption is now upon us. This post is an extract on "Markets and disruption" from a recent article, "Reclaiming 'Climate emergency'", published (in English) in a special issue on emergencies of the Slovenian journal Filozofski vestnik in March 2023.

by David Spratt

Markets crave stability and fear disruption. Yet the world is entering an era of instability and uncertainty driven in part by climate-related financial risks, preventing the market generation of reliable prices. Energy markets provide just one example. 

In 2011, Paul Gilding concluded that it was an illusion to think the contradictions can be resolved within the current economic frame and that disruption and chaos was now inevitable as system failure occurs. Five years earlier, Nicholas Stern had said that "paths requiring very rapid emissions cuts are unlikely to be economically viable" and disruptive because “it is difficult to secure emission cuts faster than about 1% per year except in instances of recession.”

Are climate–security risks too hot to handle for the Albanese government?

Heat wave in Karachi, Pakistan, June 29, 2015.  Credit:Asim Afeez/Bloomberg

by David Spratt 

[An abridged version of this article was first published by Pearls&Irritations]

The Australian government is keen to talk about defence, big submarines, China and national security. And renewable energy, big batteries, electric cars and big hydrogen. But put the two together — security and climate — and an odd thing happens. When it comes to the biggest threat to the nation, that of climate-related risks to human and regional security, there is a big black hole in the government’s discourse.  

When a declassified version of the Defence Security Review (DSR) was released on 24 April, there was a glaring omission. A short chapter on climate change focussed exclusively on domestic climate risks, specifically emergency responses to climate-warming-enhanced extreme events such as bushfires and floods, and why the defence forces should not be amongst the first responders.

[Articulating &] Reclaiming the Climate Emergency

 

Watch the discussion with Nick Breeze on ClimateGenn

by David Spratt

Recently I had the pleasure of speaking with Nick Breeze for his excellent ClimateGenn video podcasts. The subject, loosely, was my recent article, "Reclaiming 'climate emergency'", published (in English) in the Slovenian journal, Filozofski vestnik.

We discussed the origins of "climate emergency", the treatment of the term since then, and what next? How do we reclaim and respond appropriately in a real climate emergency, much like the one we are irrefutably in?

Also included, and so relevant today on the trajectory of the climate system, is a segment of an interview Nick recorded with Professor James Hansen, recorded in Vienna at the European Geophysical Union Conference in 2012. It highlights how perilous the lack of action over the last decade has really been.

• Listen to/watch [Articulating &] Reclaiming the Climate Emergency
  

The case for climate cooling, and some eye-watering charts

 

by David Spratt

Recently I had the opportunity to do one of the MEERTALKS, organised  by Mirrors for Earth's Energy Rebalancing (MEER), a network of researchers and advocates established by Ye Tao which focusses on mirror-based cooling solutions. The topic was the recent Breakthrough paper Faster, higher hotter on some takeaways from climate research in 2022. But equally it could have been called "The case for cooling".

A video of the event is now available. 

In the talk I also included some slides not in the original paper, and each is startling in its own way.

The government has a duty to be transparent about climate–security risks

By Admiral Chris Barrie, AC RAN (Ret.) & Ian Dunlop, first published at RenewEconomy

Read the report

The overblown rhetoric on imminent war with China has been justified as the need for the Australian people to be fully informed of threats to the nation. But the same rationale has not been applied to the security threat of climate change, a far greater risk the response to which will be far more costly and extensive.

Until a few months ago, the climate-change security threat had never been comprehensively assessed by any Australian government, abrogating a government’s primary responsibility to “protect the people”.     

But in late 2022, an Office of National Intelligence (ONI) initial climate risk assessment — an election promise of the Albanese government — was distributed to members of the federal cabinet. It addressed external but not domestic  climate threats. Since then there has been no government response to, or public communication of, the assessment’s findings.

IPCC: Separating the science from the politics?

The fact that the IPCC incorporates in its core business risks of failure to the Earth system and to human civilisation that we would not accept in our own lives raises fundamental questions about the efficacy of the whole IPCC project. If low risks of failure are taken as a starting point, “net zero 2050” becomes not a soundly based policy aim, but an appalling gamble with existential risk.

by David Spratt, first published at Pearls&Irritations

What credence should be given to the most recent summary report from the Intergovernmental Panel on Climate Change (IPCC)? To do that, you need to separate the science from the politics that pervades the IPCC processes.

The IPCC last week published a 36-page summary of its forthcoming AR6 Synthesis Report, which also comprises an 85-page longer summary, as well as a yet-to-be-published full volume prepared by physical and social scientists. All are based on the contents of the three main IPCC reports from 2021-22 — on the physical basis, impacts and adaptation, and mitigation — and three special reports on 1.5°C, on climate change and land, and the ocean and cryosphere in a changing climate.

The short versions are known as a Summary for Policymakers (SPMs) and are subject to political vetting. In this most recent instance, amongst many examples, Saudi Arabia vetoed a proposal saying that burning fossil fuels was the main cause of human-caused climate warming, despite the overwhelming evidence. Truthfulness was no defence in a room of climate diplomats.

Faster, higher, hotter: What we learned about the climate system in 2022 (3)

Third in a 3-part series  |  Part 1  |  Part 2

by David Spratt

So far this series has looked at:

1. Emissions trends
   
2. The 1.5°C target
   
3. Overshooting and cooling back to 1.5°C
   
4. The likelihood of achieving the 2°C target
5. 2°C degrees is not a point of system stability
6. We are heading towards 3°C or more
7. System-level change and tipping points are happening faster than forecast
   

This post looks at cascading risks, climate extremes and necessary actions.

8    Risks are cascading, and underestimated 

Climate system feedbacks can drive abrupt, non-linear change that is difficult to model and forecast, with the Earth moving to dramatically different conditions. Such changes may be irreversible on relevant time frames, such as the span of a few human generations. Major tipping points are interrelated and may cascade, so that interactions between them lower the critical temperature thresholds at which each tipping point is passed.

Climate models do not yet incorporate key processes, and therefore are deficient, especially when projecting abrupt change, system cascades, and changes in the cryosphere and in the carbon cycle. Whether it be permafrost, Greenland or West Antarctica (and hence sea-level rises), the story is the same. Current climate models are not capturing all the risks, such as the stalling of the Gulf Stream, polar ice melt and the uptick in extreme weather events. Thus Earth system and Integrated Assessment Model projections, and their use in determining carbon budgets, are not reliable. It is important that observations, semi-empirical models, expert elicitations, and lessons from past climates are given more weight, given current model deficiencies.

Faster, higher, hotter: What we learned about the climate system in 2022 (2)

Second in a 3-part series  |  Part 1   |  Part 3

by David Spratt

The first part in this series looked at:

1. Emissions trends, 
2. The 1.5°C target, 
3. Overshooting and cooling back to 1.5°C, and 
4. The likelihood of achieving the 2°C target.

This post looks at system stability at 2°C, warming at 3°C, and feedbacks and cascades.

5    2°C degrees is not a point of system stability

Even sharp reductions in emissions will not be enough to avoid crossing the 1.5°C threshold, nor the 2°C threshold, given the record-breaking use of fossil fuels in 2022 and the forecasts.

Yet it is a big mistake to think we can stabilise or “park” the Earth System at around 2°C and expect it to stay there, says Will Steffen.  Earth’s climate history shows 2°C is not a point of system stability, but a signpost on a road to a hotter planet. 

When projections in late 2021 showed future warming of around 2.7°C, Potsdam Institute Director Johan Rockström responded: “I barely even want to talk about 2.7°C… If we go beyond 2°C, it’s very likely that we have caused so many tipping points that you have probably added another degree just through self-reinforcing changes. And that’s without even talking about extreme events.” 

Faster, higher, hotter: What we learned about the climate system in 2022 (1)

First in a 3-part series  | Part 2  |  Part 3

by David Spratt

Beyond all the hype and all the anxiety about climate policymaking, the upbeat newsmaking about energy transitions and the growing dread of civilisational collapse, what have we learned about the climate system in the last year?  Here are some key observations drawn from research and data published in 2022.

1    Record emissions 

Covid supply-chain disruption and the war in Ukraine have distracted from the task of rapid emissions reductions and contributed to inflation, falling real wages and a political focus on cost-of-living pressures. The war has disrupted energy markets, driven a return to coal whose use is at an all-time high, prompted an increase in emissions-intensive arms production and use, and become an excuse for governments to delay climate action. 

Will Steffen’s crucial climate ideas on “Hothouse Earth”, tipping cascades and non-linearity

By David Spratt 

The eminent Australian climate scientist, and former Labor government advisor and head of climate at ANU, Will Steffen, who died early this week from complications following cancer surgery, will be remembered for some of the big, crucial ideas he and his collaborators contributed to the understanding of the Earth System, particularly planetary boundaries, climate tipping point vulnerabilities and cascades, risk and nonlinearity, and the “Hothouse Earth” scenario. 

Particularly in the last few years, Steffen was very clear and forthright in communicating the threat and the dynamics of the climate system, and the trajectory towards collapse:

"Given the momentum in both the Earth and human systems, and the growing difference between the ‘reaction time’ needed to steer humanity towards a more sustainable future, and the ‘intervention time’ left to avert a range of catastrophes in both the physical climate system (e.g., melting of Arctic sea ice) and the biosphere (e.g., loss of the Great Barrier Reef), we are already deep into the trajectory towards collapse … That is, the intervention time we have left has, in many cases, shrunk to levels that are shorter than the time it would take to transition to a more sustainable system.”