Assertion Supported AI assessment confidence: 92% certainty 3/5 debate potential 2/5

Buck: Tropospheric air pollution currently masks half a degree of warming

Dr. Holly Buck · The Carbon Copy: A rogue geoengineering startup sparks worry · Apr 27, 2023 · at 20:13

Dr. Holly Buck was not on this episode. A recording of them was played into it, so these are their words but not an appearance on Catalyst. It still counts as said, and it is kept out of every score on their page.

Environmental scientist Dr. Holly Buck explains aerosol masking effects and solar radiation management.

0:00 / 0:09exact quote · 9.7s

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“Air pollution in the troposphere that's currently masking quite a bit of warming by some calculations, you know, half a degree, perhaps even more.”

quote is from the automated transcript, cleaned for reading: filler sounds and stutters are removed, nothing is rephrased. names can be misheard (the analysis reads context, assessments check outside sources). how →

The claim, plainly

Existing tropospheric air pollution is currently masking an estimated half a degree Celsius or more of global warming.

a quote alone can be ambiguous, so this restates it with the references and context of the conversation around it resolved. AI-written; the tape below the player is the source.

Assessment

On the 2023-04-27 episode of 'Catalyst with Shayle Kann', Dr. Holly Buck stated that tropospheric air pollution was masking 'by some calculations... half a degree, perhaps even more' of global warming. Peer-reviewed literature and major assessment reports corroborate this figure. In the IPCC Sixth Assessment Report (AR6, August 2021), the historical cooling effect of anthropogenic aerosols was assessed at 0.0°C to 0.8°C, with central estimates around 0.4°C to 0.5°C. Furthermore, prominent multi-model studies such as Samset et al. (2018) determined that eliminating anthropogenic aerosols would unmask 0.5°C to 1.1°C of surface warming (with a median of ~0.7°C), and subsequent studies (Shindell et al. 2018; Forster et al. 2021; Hansen et al. 2023) consistently place calculations of aerosol masking within or above the 0.5°C threshold.

IPCC AR6 WGI (August 2021) estimated the net cooling effect of anthropogenic aerosols between 1850-1900 and 2010-2019 to be 0.0°C to 0.8°C, with central estimates around 0.4°C to 0.5°C and an effective radiative forcing of -1.3 W/m².
Samset et al. (2018, Geophysical Research Letters) found in a multi-model analysis that removing present-day anthropogenic aerosols induces global mean surface warming of 0.5°C to 1.1°C (median ~0.7°C).

Checked against

[1] unfccc.int [2] researchgate.net [3] citego.org [4] iiasa.ac.at [5] copernicus.org [6] wikipedia.org [7] nih.gov [8] nih.gov

"Samset" "0.5-1.1" aerosol IPCC AR6 aerosol radiative forcing temperature cooling 0.5 C IPCC AR6 aerosol cooling masking degrees Celsius "IPCC" "AR6" "aerosols" "0.0 to 0.8" OR "-0.5" temperature aerosol masking global warming half a degree peer-reviewed

assessed as of 2026-09-02

This assessment is an AI reading of a public statement, made against the cited references with the confidence shown. It can be wrong. The quote, the tape and the references are all on this page; if something is off, use report an error below. full disclaimer →

Mentioned

Air pollution in the troposphere warming

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Dr. Holly Buck Apr 27, 2023 ▶ 21:54 The Carbon Copy: A rogue geoengineering startup sparks worry

Prediction Not checkable as stated

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Dr. Holly Buck Apr 27, 2023 ▶ 15:33 The Carbon Copy: A rogue geoengineering startup sparks worry

Buck: Tropospheric air pollution currently masks half a degree of warming

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