On the brink – the scenario that the IPCC is not modelling

Daniel Tanuro responds to the recently released IPCC Physical Basis Report, which is a contribution to the Sixth Assessment Report on climate change.


The Intergovernmental Panel on Climate Change (IPCC) Working Group 1 has presented its Physical Basis Report as a contribution to the Sixth Assessment Report on climate change, due in early 2022. The report and its summary are written in the precise style and vocabulary of scientific publications that make ‘objective’ statements. However, never before has a report by global warming experts given such an impression of the anguish caused by the analysis of the facts in the light of the inescapable laws of physics.

Terrible prospects…

The anguish stems first of all from the context: the terrible floods and fires that are spreading desolation, death and fear in the four corners of the planet are the very things that the IPCC has been warning against for more than thirty years, and that governments have done little or nothing about. It also stems from the enormity of the fact, mentioned in the report, that even if COP26 (in Glasgow in November) decides to implement the most radical of the stabilisation scenarios studied by climate scientists, i.e. the one that ensures the most rapid reduction in CO2 emissions and cancels net global emissions by 2060 at the latest (while also reducing emissions of other greenhouse gases), humanity would still face terrible prospects.

 In summary:

  • The Paris target would be exceeded. The global average surface temperature would probably increase by 1.6°C (+/-0.4) between 2041 and 2060 (compared to the pre-industrial era) and then decrease between 2081 and 2100 to 1.4°C (+/-0.4);
  • Note that these are only averages: it is almost certain that the temperature on land will rise faster than on the ocean surface (probably 1.4 to 1.7 times faster). It is also virtually certain that the Arctic will continue to warm faster than the global average (most likely more than twice as fast);
  • some mid-latitude and semi-arid regions, and the monsoon region in South America, will have the highest temperature increases on the hottest days (1.5 to 2 times the global average), while the Arctic will have the highest temperature increases on the coldest days (3 times the global average);
  • On land, heat waves that used to occur once every ten years will occur four times every ten years, and those that used to occur only once every fifty years will occur nearly nine times over the same period;
  • It is very likely that additional warming (compared to the current 1.1°C) will intensify extreme precipitation events and increase their frequency (globally, 7% more precipitation for 1°C of warming). The frequency and strength of intense tropical cyclones (categories 4-5) will also increase. Intense precipitation and associated flooding is expected to intensify and become more frequent in most parts of Africa and Asia, North America and Europe. Agricultural and ecological droughts will also be more severe and frequent in some areas, on all continents except Asia, compared to 1850-1900;
  • It goes without saying that this additional global heating (of 0.5°C+/-0.4 compared to today) will continue to amplify the melting of permafrost, and thus the release of methane. This positive feedback from global warming is not fully integrated into the models (which, despite their increasing sophistication, continue to underestimate reality);
  • Ocean warming during the remainder of the 21st century is likely to be 2-4 times greater than between 1971 and 2018. Ocean stratification, acidification and deoxygenation will continue to increase. All three phenomena have negative consequences for marine life. It will take millennia to reverse them;
  • It is almost certain that glaciers in the mountains and Greenland will continue to melt for decades, and it is likely that melting will also continue in the Antarctic;
  • It is also almost certain that sea levels will rise by 0.28-0.55m in the 21st century, compared to 1995-2014. Over the next 2,000 years, it will probably continue to rise – by 2 to 3 metres – and then the movement will continue. As a result, at half the places where there are tidal gauges, exceptional tidal events that were observed once a century in the recent past will be observed at least once a year, increasing the frequency of flooding in low-lying areas;
  • Low likelihood but very high impact events could occur at the global and local level, even if warming remains within the likely range in the radical scenario (+1.6° +/-0.4°C). Even under this 1.5°C scenario, abrupt responses and tipping points – such as increased Antarctic melt and forest die-offs – cannot be ruled out.
  • One such low probability but possible event is the collapse of the Atlantic Meridional Overturning Circulation (AMOC). Its weakening is very likely in the 21st century, but the magnitude of the phenomenon is a question mark. A collapse would most likely cause abrupt shifts in regional weather patterns and the water cycle, such as a southward shift of the tropical rain belt, weakening of the monsoons in Africa and Asia, strengthening of the monsoons in the southern hemisphere, and drying in Europe.

… in the best case scenario?

This report forces us to face reality: we are literally on the brink of the abyss. All the more so because, let us repeat and insist:

 1) the projections for the sea level rise do not include the phenomena of the disintegration of the ice caps, which are non-linear and therefore cannot be modelled, and which have the potential to very quickly turn the catastrophe into a cataclysm;

2) all of the above is what the IPCC believes will happen if the world’s governments decide to implement the most radical of the emission reduction scenarios studied by scientists, the scenario aimed at not going (too far) above 1.5°C.

To detail the impacts of the other scenarios would make this text unnecessarily long. Let’s just give an indication, concerning sea levels: in the business-as-usual scenario, a rise of 2 metres in 2100 and 5 metres in 2150 is “not excluded”. And in the long term, over two thousand years, for a warming of 5°C, the seas would inevitably and irreversibly rise (on the human timescale) by… 19 to 22 metres!

Let’s recap. Implementing the most radical scenario proposed to them is not what governments are doing. Their climate plans (the “nationally determined contributions”) are currently leading us towards a warming of 3.5°C. With less than one hundred days to go until COP26, only a few countries have “upped their ambitions” … but not nearly to the necessary levels of emission reductions. For example, the EU, the “climate champion”, has set a target of 55% reduction by 2030, when 65% is needed.

A simple question of maths, and its political conclusion

Greta Thunberg once said that “The climate and ecological crisis simply cannot be solved under the current political and economic systems. This is not an opinion, it is simply a matter of mathematics.” She is absolutely right. You only have to look at the figures to see that:

1°) the world emits about 40GT of CO2 per year;

2°) the 1.5° “carbon budget” (the total amount of CO2 that can still be emitted globally without exceeding 1.5°C) is only 500Gt (for a 50% probability of success – for 83%, it is 300Gt);

3°) according to the IPCC’s 1.5°C special report, achieving zero net CO2 emissions in 2050 requires reducing global emissions by 59% before 2030 (65% in developed capitalist countries, given their historical responsibility)

4°) 80% of these emissions are due to the burning of fossil fuels which, despite the political and media hype about the breakthrough of renewables,  in 2019 still accounted for… 84% (!) of humanity’s energy needs;

5°) Fossil infrastructures (mines, pipelines, refineries, gas terminals, power stations, etc.) – the construction of which is not slowing down, or hardly at all – are major facilities in which capital is invested for some 40 years. Their ultra-centralised network cannot be adapted to renewables (they require another, decentralised energy system): it must be destroyed before capitalists can recoup their investments, and the reserves of coal, oil and natural gas must remain underground.

Therefore, knowing that three billion human beings lack the essentials and that the richest 10% of the population emit more than 50% of global CO2, the conclusion is unavoidable: changing the energy system to stay below 1.5°C while devoting more energy to satisfying the legitimate rights of the poor is strictly incompatible with the continuation of capitalist accumulation that generates ecological destruction and growing social inequalities.

The catastrophe can only be stopped in a manner worthy of our humanity by a double movement consisting of reducing global production and radically reorienting it to serve real human needs, those of the majority, democratically determined. This double movement necessarily involves the suppression of useless or harmful production and the expropriation of capitalist monopolies – first and foremost in energy, finance and agribusiness. It also requires a drastic reduction in the consumption extravagances of the rich. In other words, the alternative is dramatically simple: either humanity will liquidate capitalism, or capitalism will liquidate millions of innocent people to continue its barbaric course on a maimed, and perhaps unliveable, planet.

Robbers unite for “negative emission technologies”

It goes without saying that the masters of the world have no desire to liquidate capitalism… What will they do then? Let’s leave aside the climate deniers like Trump, those followers of Malthus who are betting on a fossil fuel neo-fascism. a plunge into planetary barbarism on the backs of the poor. Let’s also leave aside the Musks and the Bezos, those obscene billionaires who dream of leaving the ship Earth made unliveable by their greedy capitalist parasites. Let’s focus on the other, more cunning ones, those – the Macrons, Biden, Von der Leyen, Johnson, Xi Jiping… – who will fight like brigands for the Glasgow agreement to give them an advantage over their competitors, but will stick together in front of the media to try to persuade us that “everything is under control”.

To escape the above alternative, what do these gentlemen propose? Firstly, of course, making consumers feel guilty and asking them to “change their behaviour”, on pain of sanctions. Then, a set of tricks, some of which are downright crude (the failure to take into account emissions from international air and sea transport, for example), and others which are more subtle – but no more effective (for example, the assertion that planting trees – in the global South – would make it possible to absorb enough carbon to sustainably compensate for the fossil CO2 emissions of the North). But beyond these tricks, all these political managers of capital now believe (or pretend to believe) in a silver bulletincreasing the share of “low-carbon technologies” (code name for nuclear power, especially “micro-power plants”) and, above all, deploying so-called “negative-emission technologies” (NETs – or CDRs, for Carbon Dioxide Removal), which are supposed to cool down the climate by removing huge quantities of CO2from the atmosphere to be stored underground. This is the so-called “temporary overshoot of the danger threshold” of 1.5°C.

There is no need to dwell on nuclear power after Fukushima. As for “negative emission technologies”, most of them are only at the prototype or demonstration stage, and their social and ecological effects promise to be terrifying (more on this later). Nevertheless, we are led to believe that they will save the productivist/consumerist system and that the free market will take care of deploying them. In truth, this science fiction scenario is not primarily about saving the planet: it is primarily about saving the sacred cow of capitalist growth and protecting the profits of those most responsible for the mess: the oil, coal, gas and agribusiness multinationals.

The IPCC between science and ideology

And what does the IPCC think of this madness? Adaptation and mitigation strategies are not part of Working Group 1’s remit. However, it does make scientific considerations that should be taken into account by the other Working Groups. On NETs, it is careful not to rush to the brink. The Summary for Policy Makers states:

“Anthropogenic CO2 removal (CDR) has the potential to remove CO2 from the atmosphere and durably store it in reservoirs (high confidence).” The text goes on to say that “CDR aims to compensate for residual emissions to reach net zero CO2 or net zero GHG emissions or, if implemented at a scale where anthropogenic removals exceed anthropogenic emissions, to lower surface temperature.” (D1.5, p39)

Clearly, the summary endorses the idea that negative emission technologies could not only be deployed to capture “residual emissions” from sectors where decarbonisation is technically difficult (e.g. aviation): they could also be implemented on a massive scale, to compensate for the fact that global capitalism, for reasons that are not “technical” but profit-driven, refuses to give up fossil fuels. The text goes on to extol the benefits of this massive deployment as a means of achieving net negative emissions in the second half of the century:   

“Anthropogenic CO2 removal (CDR) leading to global net negative emissions would lower the atmospheric CO2 concentration and reverse surface ocean acidification (high confidence).” (D1.5 p39)

The summary makes one caveat, but it is cryptic: “CDR technologies may have potentially widespread effects on biogeochemical cycles and climate, which may either weaken or enhance the potential of these methods to remove CO2 and reduce warming, and may also influence water availability and quality, food production and biodiversity (high confidence).”

Clearly, it is not clear that NETs are all that effective, as some “effects” could “weaken (their) potential to remove CO2”. The last part of this sentence refers to social and ecological impacts: bioenergy with carbon capture and sequestration (BECCS), the most mature NETs today) could only significantly reduce atmospheric CO2 concentration if an area equal to more than a quarter of today’s permanently cultivated land was used to produce biomass – at the expense of water supplies, biodiversity, and/or feeding the world’s population.1

Thus, on the one hand, the IPCC Working Group 1 bases itself on the physical laws of the climate system to tell us that we are on the brink of the abyss, on the verge of irreversibly tipping over into an unimaginable cataclysm; on the other hand, it objectifies and trivializes the political-technological headlong rush by which capitalism is once again trying to postpone the irreconcilable antagonism between its logic of unlimited profit accumulation and the limits of the planet. “Never before has an IPCC report given off such a strong sense of the anguish caused by the scientific analysis of the facts in the light of the inescapable laws of physics,” we wrote at the beginning of this article. Never before has such a report illustrated so clearly that a scientific analysis that considers nature as a mechanism and the laws of profit as laws of physics is not really scientific but scientistic, i.e. at least partly ideological.

The IPCC WG1 report should therefore be read with the understanding that it is both the best and the worst of things. The best, because it provides a rigorous diagnosis from which to draw excellent arguments for indicting those in power and their political representatives. The worst, because it spreads both fear and powerlessness… from which the powerful benefit from even though the diagnosis accuses them! Its scientistic ideology drowns the critical spirit in the flood of “data”.

It thus diverts attention from the systemic causes, with two consequences:

1) attention is focused on ‘behavioural change’ and other individual actions – full of good will but pathetically insufficient;

2) instead of helping to bridge the gap between ecological and social awareness, scientism maintains it.

Ecologising the social and socialising ecology is the only strategy that can stop the catastrophe and revive the hope of a better life. A life of caring for people and ecosystems, now and in the long term. A simple, joyful and meaningful life. A life that the IPCC scenarios never model, where the production of use values for the satisfaction of real needs, democratically determined in respect of nature, replaces the production of goods for the profit of a minority. This ecosocialist alternative scenario will not be modeled by the IPCC. It is rational and feasible, but can only grow from the solidarity and the self-organised struggles of the exploited and oppressed.

10 August 2021

Translated from Gauche anticapitaliste (Belgium)

  • 1.See the discussion in my book Trop tard pour être pessimistes (Too late to be pessimistic), Ed. textual, 2020.

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Daniel is a certified agriculturalist and eco-socialist environmentalist, writes for “La gauche”, (the monthly of Gauche-Anticapitaliste-SAP, Belgian section of the Fourth International). He is also the author of The Impossibility of Green Capitallism, (Resistance Books, Merlin and IIRE, 2010) and Le moment Trump (Demopolis, 2018).

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