Tom Roche

To discuss the New Cold War in the South China Sea, Rania Khalek was joined by Ken Hammond, a Professor of History at New Mexico State University and author of China’s Revolution and the “Quest for a Socialist Future,” published by 1804 books. 

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We all know about the United States’ deep commercial ties with China in this day and age, but has this been the case since America’s inception? Danny and Derek are joined by Stuart Rollo, postdoctoral research fellow at the Centre for International Security Studies at the University of Sydney, for a discussion of his book Terminus: Westward Expansion, China, and the End of American Empire. The group examines the United States’ imperial evolution alongside China’s parallel trajectory, considering the (sometimes oblique) role of China in major US conflicts, domestic Chinese milestones’ effect on the US-China dynamic, the watershed change in their trade relations in the 1970s, and how America is trying to manage its current imperial decline.

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Note: Stuart was unfortunately ill with Covid when recording this episode, but said that the show must go on!

Chris McCausland asks Donna Preston and Jon Long to take on Glenn Moore and Sara Pascoe. Sara Pascoe finds a child's description of a famous film scene impossible to decipher. The two teams must figure out what on earth is being advertised on TV, guess what famous objects or locations children are trying to describe, and work out the age of members of the audience from their voice alone.

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In the feature-film adaptation of John le Carré's TINKER, TAILOR, SOLDIER, SPY (2011), Cold War-era Britain doesn't look that much different from behind the Iron Curtain - visually, at least. We discuss the challenges of compressing an intricate novel into a two-hour movie, and try to situate le Carré politically. PLUS: Taking the temperature of the snap British election, and a fond farewell to a B-movie titan.

Bryan Pitts, assistant director of the Latin American Institute at UCLA, once again sits down with Danny and Derek to help us make our way through Brazil’s history. The discussion picks up in the postwar era, covering Getúlio Vargas’ fall from power, his famous “Carta Testamento” letter, the country’s rural-to-urban migration, President Juscelino Kubits…

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Danny and Derek return with the news roundup. This week: a Gaza update (0:35), three countries recognize Palestine (10:47), the ICC pursues arrest warrants (14:17), and an ICJ hearing wraps up (18:07); Yemeni Ansar Allah / Houthi forces down two US drones, plus the US admits its bombing campaigns have been futile (20:19); the death of Iranian president Embrahim Raisi (25:16); Taiwan inaugurates a new president and sees protests at the parliament while China conducts military drills nearby (27:38); protests and riots in France’s New Caledonia colony territory, prompting a visit from Macron (29:49); the US finally sets a date for withdrawing troops from Niger (33:52); Kenya’s William Ruto visits the US, with the former country’s mission to Haiti starting soon (34:40); an update on the Kharkiv offensive in Ukraine (36:58); and the UK schedules an election for July 4 (39:22).

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Aaron and David speak to Jefferson Morley about the recently released, newly less-redacted version of the James Angleton’s executive session testimony of to the Church Committee in 1975. Morley is a Washington-based author and veteran journalist whose novelistic non-fiction books explore untold chapters in the history of the American nation. Most relevant to today’s discussion, he is the author of 'The Ghost: The Secret Life of CIA Spymaster James Jesus Angleton'.

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The struggle for justice in Palestine isn’t just a fight against the settler colonial Zionist project. It’s a struggle against US imperialism itself. To discuss this and more, Rania Khalek was joined by Bikrum Gill, a political scientist and author of the forthcoming book “The Political Ecology of Colonial Capitalism: Race, Nature, and Accumulation.”

This is just part of this episode. The full interview is available for Breakthrough News Members only. Become a member at https://www.Patreon.com/BreakthroughNews to access the full episode and other exclusive content.

Past episodes with Bikrum:
https://youtu.be/F8GMyxAWjYk?si=4a2X1CWUNhn4Cq3O
https://youtu.be/3OV31mk8rns?si=-Ho7-sJQdPtmr9E3

We’re joined by DJ Byrnes of the independent news outlet The Rooster to take a look at the politics of OHIO, the most normal state in the union. With a trillion dollar nuclear energy scandal that led to multiple suicides, mayors entrapped by a Chinese spy honeypot operation, bribe-addicted polyamorous atheist city councilmen, charter school ponzi schemes, and FBI arrests, indictments and convictions of dozens of members of state and local government…extremely normal.

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The Rwanda bill passes through parliament so will Rishi call an election? Who is really behind the rumours about Angela Rayner? Will Rylan and Stacey Solomon manage to say anything sensible? All questions answered.

The series writers include: Nev Fountain & Tom Jamieson, Ed Amsden & Tom Coles, Laurence Howarth, Rob Darke, Edward Tew, Sophie Dixon, Sarah Campbell, Toussaint Douglass, Cody Dahler, Joe Topping, Alex Bertulis-Fernandes, Angela Channell, Lizzy Mansfield, Christina Riggs, Peter Tellouche, Rachel Thorne, and Sarah Dempster.

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Neo Lekgotla laga Ramoupi (History, University of the Free State) on his new book, Cultural Resistance on Robben Island: Songs of Struggle and Liberation in South Africa (Skotaville 2024). After discussing the genesis of his scholarly interests, Dr. Ramoupi describes prisoners’ music— instruments, genres, styles—and its impact on surviving apartheid’s harshest prison. He then reflects on the relationship between prisoners and guards, and changes in Robben Island prison culture over time. The interview closes with Ramoupi’s reflections on the film, Amandla! A Revolution in Four-Part Harmony, and a preview of his new Mellon Foundation-funded research project.

Maybe it's a fool's errand to look for politics in the Marx Brothers' DUCK SOUP (1933), but nevertheless, many have tried. We discuss the philosophy of the Brothers' tomfoolery, and the way that movies and literature imagine countries like Freedonia. Join us on Patreon for an extra episode every week - https://www.patreon.com/michaelandus

This week we spotlight our first screenwriter with two films written by Dennis Potter: 1983’s Gorky Park (d. Michael Apted) and 1981’s Pennies from Heaven (d. Herbert Ross). Gorky Park is a police investigation thriller set in Soviet Russia concerning a gruesome murder involving a sable smuggling ring, and Pennies from Heaven features Steve Martin in one of his few dramatic roles as a depression era sheet music salesmen who escapes his dreary life through elaborate musical fantasies and a love affair with Bernadette Peters as an innocent schoolteacher. While wildly different in subject and tone, they illustrate Potter’s range and depth as a writer over his prolific career. Get bonus content on Patreon

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The Pendejo boys are back ostensibly to cover some new Greg Abbott shenanigans out of Texas, but we also look at the ICC seeking arrest warrants for Netanyahu and Yoav Gallant, the collapse of Red Lobster, a GOP candidate out of Missouri literally running against being “weak and gay,” and Chiefs’ kicker Harrison Butker’s redpilled address to Benedictine graduates. 

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We have on returning Corner Späti champion, Milo Edwards, to chat the news and how, in an odd turn of events, Azerbaijan has attempted to become the face of French decolonization. Yes, it has something to do with Armenia.

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Will & Hesse are joined by Aaron & Carlee of the Hit Factory Podcast to discuss two neo-noirs, 1991’s One False Move directed by Carl Franklin, and 1994’s The Last Seduction directed by John Dahl. Both explore the classic noir themes of evil, greed, lust & betrayal, with One False Move exploring the dark brutality of the genre, and The Last Seduction having sexy fun with it. Enjoy the 90’s Bills quadruple feature of Paxton, Pullman, Bob Thornton & Buffalo. Also, Linda Fiorentino 🔥🔥🔥🥵.

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US Without a Strategy in Ukraine? - Stephen Bryen, Alexander Mercouris & Glenn Diesen

Danny and Derek chat with AP Iran expert Sina Toossi, senior non-resident fellow at the Center for International Policy, about the late Iranian president Ebrahim Raisi, who was killed in a helicopter crash on Sunday along with foreign minister Hossein Amir-Abdollahian. The group delves into Raisi’s background and ideology, the next steps to find a new p…

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Danny and Derek are once again joined by Bryan Pitts, assistant director of the Latin American Institute at UCLA, to discuss the history of Brazil. This episode starts in the late 19th century with Brazil’s “racial democracy”, exploring the rise of rubber as a primary commodity, industrialization, the abolition of slavery, Getúlio Vargas and the Revolut…

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A long overdue enquiry into an ill advised away-day. Episode 5 in the original series. May contain strong language.

No Room features an up to the minute take on current events, alongside character-filled sketches which brilliantly capture everything that provokes us - culture, politics, work...and other people.

Michael is famous for his Room Next Door government advisor character whose withering take downs of politicians have amassed more than 100 million views and helped keep his audience sane in fractured times.

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In this bonus episode, Jim and Greg pay tribute to musician, recording engineer, writer and Chicago legend Steve Albini, who died May 7 at the age of 61. They're also joined by their production staff to discuss Albini's cultural legacy.

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Danny and Derk once again chat with Akbar Shahid Ahmed, senior foreign affairs reporter at HuffPost, this time about his recent piece “Biden Administration: 'Reasonable' To Say Israel Is Violating International Law, But U.S. Aid Can Continue”.

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The Now Show first aired on BBC Radio 4 in September 1998 and this week sees its last ever episode. Steve Punt and Hugh Dennis take a look back over the last 25 years, with help from the voices of Gemma Arrowsmith and Rory Bremner.

They are joined by Glenn Moore investigating the Beijing Half Marathon scandal and Harriet Kemsley on the law firm who accidentally divorced the wrong couple. Plus, Jazz Emu looks to the future with an original song accompanied by his band Matt Hutson, Luke Bainbridge and Tom Marlow.

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We’re joined by Bryan Quinby to review Jerry Seinfeld’s new Netflix film Unfrosted, about the invention of Pop Tarts. We dive into this bizarre & joyless cultural artifact which is a parade of humiliation for the numerous comedians featured in it, and a window into the seemingly bottomless well of misanthropy underneath Seinfeld’s banal observational humor. A romp!

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There is no doubt about it – climate science can be complex. But sometimes this complexity is mistaken for uncertainty. A recurring example is our scientific understanding of carbon dioxide’s (CO₂) effects as a greenhouse gas^[2]. However, the evidence for CO₂ as a greenhouse gas is well-established and is built on a body of scientific evidence that started around 1856 and has been growing for over a century.

Given the complexity of this subject, pieces of the ‘puzzle’ are often taken out of context to support misleading and incorrect conclusions denying CO₂’s influence on global temperatures. For example, on 24 April 2024, an article was posted on The Daily Sceptic claiming that CO₂ emissions can’t warm the atmosphere because it is “saturated”. Given the recurring nature of this claim, below we will explain how CO₂ functions as a greenhouse gas, then use scientific evidence to investigate recent claims about ‘CO₂ saturation’.

 

A brief history of studying CO₂ as a greenhouse gas

While remaining in the atmosphere, CO₂ prevents heat from escaping and consequently warms the surface of Earth – a concept that is popularly known as the greenhouse effect (described in greater detail in the next section). Below we will highlight some key historical findings that laid the foundation for understanding CO₂’s effects as a greenhouse gas. As you will see, this is not a new area of study, but rather a subject that has been studied and discussed for over 100 years. This distinction will be important later when investigating claims regarding ‘CO₂ saturation’, which were addressed by scientists decades ago. Below is a timeline summarizing how scientists developed an understanding* of CO₂’s properties and the greenhouse effect:

• 1760: The beginning of the industrial revolution. Atmospheric CO₂ levels were around 280 parts per million (ppm)^[1] – current levels are at 425 ppm as of May 2024.
• 1827: Fourier, French mathematician, determined that almost all heat lost from a planet is through infrared radiation (this was later important to our understanding of the greenhouse effect).
• 1856: Eunice Foote, American scientist, discovered that sunlight heats up air containing water vapor and CO₂ (i.e., certain gases trap heat).
• 1859: John Tyndall, Irish physicist, discovered that CO₂, water vapor, and ozone effectively trap heat even in relatively small quantities, while other atmospheric gases have little heat-trapping effect by comparison.
• 1896: Svante Arrhenius, Swedish scientist, quantified the warming from carbon dioxide’s greenhouse effect.
• 1938: Guy S. Callendar, English engineer, published a paper suggesting that human CO₂ emissions were increasing temperatures on Earth.
• 1955: Gilbert Plass, Canadian physicist, calculated the effect of added CO₂ on Earth’s radiation balance.
• 1958: Charles Keeling, American scientist, began collecting daily CO₂ measurements in the air above Mauna Loa, Hawaii, and measurements have continued to the present day.
• 1967: Manabe and Wetherald calculated a predicted temperature rise based on a doubling of CO₂ by creating one of the world’s first accurate computer models of Earth’s climate.
• 1990: Publication of the Intergovernmental Panel on Climate Change (IPCC) First Assessment Report with evidence linking rising CO₂ levels to observed global temperature rise.
• 1990-2024**: A vast number of studies collected evidence linking rising CO₂ to increasing global temperatures – including models with improved accuracy, paleoclimate studies, satellite data, and instrumental temperature records^[2-7] (detailed in sections below).

*Please note that the older/foundational studies and papers do not represent the current state of climate science knowledge, but are listed above to show that some aspects of climate science have been long-established (e.g., the greenhouse effect).

**For the sake of brevity, we mainly listed earlier studies to demonstrate how long scientists have studied CO₂ as a greenhouse gas. However, for clarity, we would like to note that the strongest scientific evidence has been found in the last few decades.

 

How rising atmospheric CO₂ concentrations are increasing global temperatures through the greenhouse effect

To describe how atmospheric CO₂ warms Earth, we will start at a zoomed out scale – looking at the Sun, Earth, and space – then zoom in to explain what’s happening on a molecular scale. Understanding what occurs at both scales helps paint a clearer picture of the greenhouse effect and CO₂’s role therein.

When we zoom out, we see that nearly all of Earth’s incoming energy comes from the Sun, and all of its lost energy goes back out to space. And it’s the balance between these gains and losses that changes Earth’s temperatures. When the amount of incoming solar energy is different from the amount going back out to space, our climate can be described as imbalanced; if incoming energy is greater, Earth warms, and if outgoing is greater, Earth cools. As this energy is trapped, it is also stored in different parts of Earth’s climate system including oceans, land, ice, and atmosphere. This energy balance is illustrated in Figure 1 below.

Figure 1 – Earth’s energy budget showing a balanced climate on the left (balanced incoming and outgoing energy), and an imbalance climate on the right (incoming energy greater than outgoing energy) where excess energy is being stored in components of Earth’s climate system (e.g., oceans, ice, land, and atmosphere). Source: IPCC Sixth Assessment Report^[2]

 

This explains how Earth warms, but now we must zoom in to the molecular scale to understand why this occurs. Afterall, given that the frigid vacuum of space is around -455° Farenheit (-270°C), why wouldn’t Earth quickly lose its incoming energy from the Sun? The key is the composition of our atmosphere – namely, the presence of greenhouse gases, such as CO₂, which help trap heat. As explained in the timeline from our first section, the relationship between CO₂ and global warming was discovered in the mid-19th century. Around that time, scientists discovered that certain molecules (greenhouse gases) absorb and re-emit infrared (IR) radiation (i.e., longwave radiation), while others allow it to pass right through – characteristics described as opaque and transparent, respectively^[3,4]. This is important because, while these molecules do not absorb sunlight (shortwave radiation), Earth’s surface does. And in response, it emits IR radiation back towards the atmosphere where it is absorbed by CO₂, then re-emitted in all directions, with some going back to Earth and some escaping to space^[3]. The IR radiation that travels back to Earth’s surface raises its temperatures, while that which is lost to space lowers its temperatures – part of the energy balance mentioned earlier. Below are two figures showing this process at different scales. Figure 2 shows this process at a zoomed out scale (i.e., showing incoming and outgoing radiation), with yellow arrows representing solar radiation (shortwave) and orange arrows representing IR radiation (longwave). Note that the greenhouse gases act as barriers, intercepting and redistributing outgoing radiation as heat. Without greenhouse gases, IR radiation (heat) emitted from the Earth would simply escape to the cold vacuum of space. Figure 3 shows what is occurring at a molecular scale as greenhouse gases interact with IR radiation (shown as orange arrows in Figure 2).

Figure 2 – Illustration of the incoming and outgoing energy as affected by the natural greenhouse effect (left) and the enhanced greenhouse effect (right). Water vapor (H₂O) plays an important role in maintaining the natural greenhouse effect, while rising CO₂ is driving the human-enhanced greenhouse effect. Incoming solar shortwave radiation is represented by the yellow arrows and outgoing terrestrial longwave radiation is represented by the orange arrows. Source: Climate change: Strategies for mitigation and adaptation^[8]

Figure 3 – Radiative and kinetic energy transfer in greenhouse gases vs. non-greenhouse gases in response to IR radiation. Note that greenhouse gases absorb IR radiation and transfer the energy through motion or re-emission, while non-greenhouse gases have little to no interaction with IR radiation. Source: Skeptical Science/John Garrett

 

The interactions at a molecular scale are important because they explain why CO₂ is able to drive global warming^[2], despite being a lower percentage of Earth’s atmosphere than nitrogen (N₂) and oxygen (O₂), for example; CO₂ absorbs and re-emits IR radiation, while N₂ and O₂ do not in Earth-like conditions^[4] (Figure 3). Early experiments revealed this property of CO₂ and the theory of the greenhouse effect, but it wasn’t until later that scientists found unequivocal evidence that rising CO₂ is driving modern global warming. Much of this evidence was collected from 1990-2024, as noted by the placeholder from the timeline in our first section. Science Feedback has summarized some of this evidence in several past reviews, which are linked below:

• Review 1: Link between CO2 and Earth’s temperature is well-established, despite claims on Fox News
• Review 2: Video of Ian Plimer incorrectly states that human CO2 emissions are not responsible for increased atmospheric CO2 concentrations and global warming
• Review 3: CO2 caused warming during past climate changes, notably as a feedback amplifying other factors

 

The key takeaway from these past reviews is that scientists have found overwhelming evidence linking rising CO₂ to increasing global temperatures in modern times. For example, scientists found that in modern times, greenhouse gases overall cause the most global warming of all the climate change drivers, and CO₂ causes the most global warming of all the greenhouse gases (Figure 4).

Figure 4 – The contributions of different drivers to global warming from the present time period (2010-2019) relative to the time period of 1850-1900. The estimates of warming (red) and cooling (blue) from radiative forcing studies (panel (c)) are based on both direct emissions into the atmosphere and their effect, if any, on other climate drivers. Source: IPCC (2021)^[2]

 

Evidence also shows that global temperatures increase logarithmically as atmospheric CO₂ concentrations rise, with a 20-year lag response^[3,9](Figure 5).

Figure 5 – Radiative forcing of CO2 (relative to the atmospheric CO2 concentration of 389 ppm–the concentration at the time of the study). Source: Zhong and Haigh (2013)^[3]

 

This finding is particularly important because it shows that although additional radiative forcing lessens gradually with increasing CO₂ concentrations, it remains positive (i.e., temperature does not stop rising)^[3]. This is clearly visible in Figure 5, where radiative forcing continues to rise with CO₂ concentrations. It is worth noting that although the slope becomes more gradual, the resulting global warming is still predicted to have negative consequences for humans and ecosystems. As explained by the IPCC, “risks and projected adverse impacts and related losses and damages from climate change escalate with every increment of global warming.”^[2] Zhong and Haigh (2013) concluded that as CO₂ increases in the atmosphere, there is no saturation point at which it will no longer cause radiative forcing – therefore, it will continue to be a factor in global warming^[3].

The vast body of evidence for CO₂’s climate effects lead the IPCC, the world’s leading authority on climate science, to state that “the evidence is clear that carbon dioxide (CO₂) is the main driver of climate change”. However, despite a vast body of evidence and overwhelming consensus among climate scientists^[2,10], claims questioning CO₂’s radiative forcing capabilities still arise. These claims often mischaracterize and oversimply more complex aspects of CO₂ radiative forcing (e.g., physics of IR radiation absorption) to support their argument. For this reason, in the next section we will delve one layer deeper into radiative forcing to investigate these claims, and we will conclude with comments from climate science experts to offer additional insight.

 

Unequivocal evidence for radiative forcing from atmospheric CO₂, driving global warming; no evidence showing that this effect is saturated

So far we have discussed the historical and scientific evidence of CO₂’s effects as a greenhouse gas. Based on this information, the science behind the greenhouse effect – and CO₂’s contribution to it – are well-established. But how do scientists know that radiative forcing from CO₂ is ongoing, and has not reached an upper limit?

As previously mentioned, people continue to make claims questioning CO₂’s ongoing capacity to function as a greenhouse gas – namely, that it can ‘no longer warm Earth’s atmosphere because CO₂ is saturated’. However, this claim is far from being new. In fact, it originated in the early 20th century when the study of the greenhouse effect (prior to be coined as such) was in its infancy. From the timeline we shared earlier, you will recall that in 1896, Svante Arrhenius quantified the warming effect from increasing atmospheric CO₂. In 1900, Knut Ångström, Swedish physicist, used experimental data – later found to be inaccurate^[4] – to claim that CO₂ is unable to affect Earth’s climate because of saturation of the center of the absorption band (around 15 nanometers) and overlap between the absorption bands of CO₂ and water vapor. Despite being debunked decades ago (as will be explained below), people continue to share these claims. Below we will explain why these claims are incorrect based on available evidence.

The first recurring claim is that there is ‘saturation of the center of the absorption band for CO₂, so it can no longer cause warming’. However, there are several issues with this claim that make it misleading and inaccurate, as detailed below. The first reason this is inaccurate can be explained by an excerpt from Zhong and Haigh (2013): “while the centre of the 15μm band becomes saturated, the band wings and, especially, the 10μm bands become dominant in determining the radiative effects – and these are nowhere near saturation”^[3]. They further explain: “We conclude that as the concentration of CO₂ in the Earth’s atmosphere continues to rise there will be no saturation in its absorption of radiation and thus there can be no complacency with regards to its potential to further warm the climate.”

It’s worth taking a brief aside here to describe why greenhouse gas molecules absorb infrared radiation. Earlier, when we introduced the concept of greenhouse gases, we mentioned the terms opaque and transparent. Normally these words are used to describe materials that either allow light to pass through (transparent) or be blocked (opaque). This occurs because the material either absorbs the wavelengths of light or allows it to pass through. Absorption bands – mentioned in the claim and our cited quote above – refers to wavelengths at which a molecule absorbs radiation. Molecules can therefore be either transparent or opaque to certain wavelengths of radiation. In the case of CO₂, for example, it is transparent to sunlight but opaque to IR radiation, thus absorbing and re-emitting it. And as explained in the quote from Zhong and Haigh (2013), there are still regions of the absorption bands where CO₂ is opaque. They reference the 15μm band (which is the center band mentioned in the ‘saturation’ claim) and the 10μm bands which are “nowhere near saturation”. Other studies have shown similar findings. For example, Figure 6 below from Pierrehumbert (2011) shows the absorption bands for H₂O and CO₂, respectively, with regions that do not totally overlap. Note that current and projected atmospheric CO₂ concentrations fall within the range (e.g., 300 ppm to 1200 ppm) where the ‘band wings’ become dominant in determining radiative forcing, as explained in the earlier quote by Zhong and Haigh (2013).

Figure 6 – Absorption coefficients for CO₂ (red) and H₂O (blue) as a function of wavenumber. The top graph is a plot of the Planck function which shows how different spectral regions (i.e., ranges of wave numbers) affect Earth’s energy balance (i.e., flux of energy leaving Earth). The dashed horizontal lines show where CO₂ strongly absorbs for atmospheric CO₂ concentrations of 300 ppm to 1200 ppm (current concentrations are at 425 ppm in May 2024). The inset graph on the right shows a region of overlap between absorption of IR radiation for H₂O and CO₂. The green rectangle represents the range of the spectrum where IR radiation is absorbed at low CO₂ concentrations, while the orange rectangle represents the expanded absorption range occurring at higher concentrations. Source: Pierrehumbert (2011)^[4]

 

Claiming that ‘CO₂ is saturated’ is also misleading due to its imprecision; it does not specify what altitude or region CO₂ is becoming saturated, which treats the atmosphere as a single, homogeneous unit where all CO₂ is saturated by IR radiation. But in reality, Earth’s atmosphere is stratified; different altitudes have different physical conditions (e.g., pressures, temperatures, and chemical compositions) (Figure 7). The type and amount of absorbed radiation can vary by altitude, and thus have different implications for global warming. For example, there is far more water vapor near Earth’s surface than in the upper atmosphere – where Earth’s heat is lost – and therefore lower competition between CO₂ and H₂O at higher altitudes^[4].

Figure 7 – Different layers of Earth’s atmosphere (not to scale) including, from closest to farthest from Earth’s surface, the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The red arrows indicate the main/net directions of re-emitted radiation after absorption; CO₂ in the outer layers of Earth’s atmosphere radiates heat to space causing cooling, while CO₂ in lower layers traps heat and raises global temperatures. Source: NCAR/NSF

 

This distinction is important to understand why the ‘CO₂ saturation’ and the ‘competing H₂O-CO₂ absorption’ claims are incorrect. As explained in Pierrehumbert (2011):

“A related saturation fallacy, also popularized by Ångström, is that CO₂ could have no influence on radiation balance because water vapor already absorbs all the IR that CO₂ would absorb. Earth’s very moist, near-surface tropical atmosphere is nearly saturated in that sense, but the flaw in Ångström’s argument is that radiation in the portion of the spectrum affected by CO₂ escapes to space from the cold, dry upper portions of the atmosphere, not from the warm, moist lower portions.”^[4]

The paper also explains that the inset of Figure 6 above shows that:

“the individual water-vapor and CO₂ spectral lines interleave but do not totally overlap. That structure limits the competition between CO₂ and water vapor.”

As we’ve shown, climate scientists have found overwhelming evidence that CO₂ raises global temperatures through radiative forcing. However, scientists long had trouble collecting one of the final pieces of evidence: high-quality, continuous satellite observations of outgoing IR radiation. But things changed in 2023 when a new study reported their findings after analyzing IR satellite measurements from 2003-2021. Raghuraman et al. (2023) explained that “these unprecedented observations provide measurements of Earth’s emitted thermal heat at fine-scale wavelengths, that is, the infrared spectrum, allowing us to pinpoint the effect of greenhouse gas concentration increases on Earth’s climate. We find large increases in the heat trapped by CO₂, CH₄, and N₂O”^[7]. Outgoing radiation is a critical part of the energy balance model we discussed earlier (i.e., incoming vs. outgoing energy). The benefit of collecting these data via satellite is that they show the final ‘signature’ of outgoing radiation – the end result of the complex radiative transfers occurring on Earth.

 

In summary, claims regarding CO₂ saturation are nothing new, and proven to be inaccurate by several decades of scientific evidence. In recent times, new forms of scientific evidence, such as satellite observations of outgoing radiation^[7], have only further shown that CO₂ is not saturated and is still driving radiative forcing. Despite this, people still make these claims, as evidenced in The Daily Sceptic article posted on 24 April 2024. To supplement our investigation of general claims regarding CO₂ saturation, we invited climate science experts to provide comments on The Daily Sceptic article and the following claims made within:

Claim 1: “Scientific evidence has emerged to suggest that the Earth’s atmosphere is ‘saturated’ with carbon dioxide, meaning that at higher levels the ‘greenhouse’ gas will not cause temperatures to rise” (referencing Kubicki et al. 2024)

Claim 2: “climate modellers and scientists in the anthropogenic camp are no nearer putting a temperature rise on a doubling of CO₂ in the atmosphere. Estimates from 0.5°C up to around 6°C, with some outliers as high as 10°C, are little more than guesses”

Below is the feedback we received from climate science experts.

 

SCIENTISTS’ FEEDBACK

Paulo Ceppi, Lecturer, Imperial College London:
The claims are completely unfounded. On the first point: there is scientific consensus that the Earth’s atmosphere is far from being saturated with CO₂, in terms of its radiative impact. Hence as long as CO₂ concentration increases, the greenhouse effect strengthens and thus global temperatures rise. Our best estimate is that global-mean temperature increases approximately linearly with cumulative CO2 emissions (see e.g. the IPCC 6th Assessment Report)^[2], and logarithmically with CO2 concentration.

On the second point: our best estimate of the global-mean temperature change for a doubling of CO₂ is 3°C (at equilibrium, so this is a long-term response), with a 90% range of 2-5°C. This is again summarised in the 6th Assessment Report of the IPCC, Working Group 1.^[2]

 

Ralph Keeling, Professor, Scripps Institution of Oceanography:
The impact of CO₂ on climate does not saturate in the way the Kubicki article implies. It’s true that CO₂ becomes less potent as a greenhouse gas as levels continue to rise, due to an effect known as ‘band saturation’. But there is no hard stop, and this saturation effect, which is well understood, is built into our understanding of climate change.

 

Raymond Pierrehumbert, Professor, University of Oxford:
[In response to Ralph Keeling’s comment:] Yes, that’s right, and covers the situation up to any concentration of CO₂ the Earth has had in the past three billion years or so. However, even after all bands are ‘saturated’ relative to transmission from the surface to space, adding more CO₂ continues to provide warming, since adding more CO₂ raises the altitude of the level from which radiation escapes to space, and it becomes colder relative to the ground temperature because of the temperature profile in optically thick atmospheres. That’s how Venus gets so hot. The whole ‘CO₂ saturation’ myth is just obfuscation.

 

Joanna Haigh, Emeritus Professor, Imperial College London:
The main points made by Kubicki with respect to saturation of the CO₂ 15 micron band are correct – viz [namely] as the centre of the band saturates more absorption occurs in the wings. However, his analysis is oversimplistic. The variation of radiative forcing with increasing concentration is shown in the paper attached which takes account of spectrally resolved absorption right across a wide spectral range and concludes that the band is nowhere near saturated. See Figs 5&6 [from Zhong and Haigh (2013)].

The current estimate for equilibrium climate sensitivity is “likely in the range 2.5°C to 4.0°C, and very likely between 2.0°C and 5.0°C” (IPCC AR6)^[2]. The gratuitous statement that these are “little more than guesses” couldn’t be further from the truth. They are the result of extremely careful analysis of data from a range of sources including records of historical surface temperatures such as those deduced from ice cores over 100,000’s years and instrumental records since 1850. It is also estimated through computer model simulations ranging from simple energy balance models to more complex global climate models. The wide range results from uncertainties in details of how the climate modifies the impact, through, for example, changes in humidity, clouds and ice.

 

Ella Gilbert, Research Scientist, British Antarctic Survey:
Climate sensitivity (the temperature change associated with a doubling of atmospheric CO₂) is a stubborn number to pin down. Estimates haven’t changed much in the decades since it was first introduced as a concept, and the most recent IPCC report pegs it at 2.5-4 C:

“equilibrium climate sensitivity (ECS) is likely in the range 2.5°C to 4.0°C, and very likely between 2.0°C and 5.0°C.”^[2] (IPCC WG1 AR6 report, chapter 7. See also: Figure 1.16 AR6 WG1 Chapter 1).

Figure 8 – Equilibrium climate sensitivity outcomes showing likely range and low-likelihood outcomes. Source: IPCC Sixth Assessment Report^[2]

 

This isn’t so very different from the range reported in the first real attempt to quantify it by Charney and colleagues in 1979: 1.5-4.5 C (Charney et al., 1979).

This is because of the complexity of the processes involved and the question marks that remain about important feedbacks in the climate system, especially relating to clouds and cloud feedbacks. We are still learning more about these feedbacks, and about how they may change. Numerous scientists have noted how difficult it is to narrow down the climate sensitivity (e.g. Sherwood et al., 2020; Sherwood & Forest, 2024)^[12,13].

However, while scientists may disagree about exactly where in (or indeed above) this range the value of climate sensitivity lies, that doesn’t matter for refuting the central tenet of this article: that greenhouse gas emissions do not warm the atmosphere. This argument wilfully misunderstands the greenhouse effect.

Atmospheric greenhouse gases do not have a finite energy absorption capacity – rather, molecules of CO₂ are constantly emitting and absorbing energy. Hence the idea that the atmosphere is ‘saturated’ with respect to CO₂ is incorrect. There’s a much more eloquent rebuttal of this on skeptical science: https://skepticalscience.com/saturated-co2-effect.htm

More simply, climate sensitivity is positive, meaning that greenhouse gas emissions increase global average temperatures. This has been established using many lines of evidence, including historical observational data, proxies from much longer time periods (over tens or hundreds of thousands, or millions of years) and model simulations^[13,2].

As an aside: one should also always be wary of climate science papers published in journals specialising in fields outside of climate science. For instance, the paper this claim hinges on is published in an engineering journal that has no reputation within the climate sciences. It’s highly unlikely this paper would have even made it past the editor of any well-regarded journal in the field.

 

REFERENCES:

• 1 – IPCC (2014). Fifth Assessment Report.
• 2 – IPCC (2021). Sixth Assessment Report.
• 3 – Zhong and Haigh (2013) The greenhouse effect and carbon dioxide. Royal Meteorological Society Weather.
• 4 – Pierrehumbert (2011) Infrared radiation and planetary temperature. Physics Today.
• 5 – Kaufman et al. (2020) Holocene global mean surface temperature, a multi-method reconstruction approach. Nature.
• 6 – PAGES 2K Consortium (2019) Consistent multidecadal variability in global temperature reconstructions and simulations over the Common Era. Nature Geoscience.
• 7 – Raghuraman et al. (2023) Greenhouse Gas Forcing and Climate Feedback Signatures Identified in Hyperspectral Infrared Satellite Observations. Geophysical Research Letters.
• 8 – Wang et al. (2023) Climate change: Strategies for mitigation and adaptation. The Innovation Geoscience.
• 9 – Huang and Shahabadi (2004) Why logarithmic? A note on the dependence of radiative forcing on gas concentration. Journal of Geophysical Research: Atmospheres.
• 10 – Anderegg et al. (2010) Expert credibility in climate change. Proceedings of the National Academy of Sciences.
• 12 – Sherwood et al. (2020) An Assessment of Earth’s Climate Sensitivity Using Multiple Lines of Evidence. Review of Geophysics.
• 13 – Sherwood and Forest (2024) Opinion: Can uncertainty in climate sensitivity be narrowed further?. European Geoscience Union.

Note: Scientists comments were lightly edited for clarity (i.e., information was added in brackets for context and minor punctuation changes were made).

Alex is on today as we catch up with the weekend’s drama over the 2024 Eurovision song contest and ask which is more real, twitter or Eurovision (those are the only two options). Then, some disastrous new polls for the Biden campaign, Trump searches for a VP and praises Hannibal Lecter, and Bret Stephens & Gail Collins search for the true value of a commencement speech and decide it’s about telling kids to get off their damn phones.

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David Roth joins us for a look at sports gambling’s rapid rise and infiltration of every institution of professional sports. We look at how it developed, who’s affected, the insidious exploitation of gambling addiction, and how the permissibility of gambling has extended to players in the leagues themselves. We also discuss RFK Jr.’s brain worm, and the crypto bracelet entrepreneur who gave the worst commencement speech of all time at Ohio State.

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Corbin Smith’s Defector piece on sports gambling mentioned in the ep: https://defector.com/sports-is-betting-it-all-on-gambling

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We’re joined by a former university administrator (who prefers to remain anonymous, though we have reviewed and verified their credentials) for an insider’s perspective of the current state of college administration, and a discussion of just why colleges and universities around the country are reacting with such extreme opposition and often violence to the ongoing pro-Palestinian protests. Topics include increasingly corporate university structure, internal bias against certain perspectives and student organizing, and the foreign influence over university operations. Get bonus content on Patreon

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Danny and Derek welcome to the podcast Khalid Medani—associate professor of political science, director of the Institute of Islamic Studies, and chair of the African Studies Program at McGill University—for a deep dive into the conflict that has engulfed Sudan since last Spring. They delve into its roots going back to the 1989 coup, break down the makeup of the primary combatants (the Sudanese Armed Forces and the paramilitary Rapid Support Forces), how these groups are able to continue recruiting and maintain support networks, the conflict’s catastrophic humanitarian crisis and regional effects, foreign mercenaries and whether it has become a proxy war, efforts of local civil leaders to quell the fighting, and what things might look like moving forward.

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As Khalid noted, two places to which he recommends you donate are the Sudanese Doctors Union or the Sudan Solidarity Collective.

Some of Khalid’s recent work:

• “The Struggle for Sudan” from Middle East Report’s Spring 2024 issue is a primer on Sudan.

• Middle East Research and Information Project’s Spring 2024 issue has multiple contributors, including Khalid, writing about the conflict.

• His book Black Markets and Militants: Informal Networks in the Middle East and Africa, which is free via Open Access.

• “Opinion: The brutal conflict in Sudan is not a civil war. It’s a war on civilians” from The Globe and Mail.