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Earth's oxygen-rich atmosphere may owe its existence to cold subduction

Phys · · 1011 words · By Krystal Kasal
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What to know about Earth's oxygen-rich atmosphere may owe its existence to cold subduction

The article reports on a study published in the Proceedings of the National Academy of Sciences regarding the role of 'cold subduction' in Earth's long-term oxygenation. It explains how the sinking of oceanic plates may have reduced oxygen sinks, allowing atmospheric oxygen to accumulate in three major stages over billions of years.

Propaganda risk 0%
Claims checked 10
Techniques found 0
Topics 0

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center75%
Right25%

4 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

May 27, 2026 report Earth's oxygen-rich atmosphere may owe its existence to cold subduction Krystal Kasal Author Gaby Clark Scientific Editor Robert Egan Associate Editor Earth was mostly devoid of oxygen for much of its 4.5 billion year lifetime.

Why it matters

That is, until certain processes started to allow for the eventual buildup of oxygen up to the levels we have now (around 21% of the atmosphere).

Common ground

While scientists have found evidence of the approximate timescales of rises in oxygen over time and are aware of some of the mechanisms behind it, the main driver behind Earth's long-term oxygenation is still unclear.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

The article reports on a study published in the Proceedings of the National Academy of Sciences regarding the role of 'cold subduction' in Earth's long-term oxygenation. It explains how the sinking of oceanic plates may have reduced oxygen sinks, allowing atmospheric oxygen to accumulate in three major stages over billions of years.

open_in_new Read the original article: https://phys.org/news/2026-05-earth-oxygen-rich-atmosphere-owe.html

analyticsAnalysis

0%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 10 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 3
info Single Source 2
verified Verified By Reference 2
verified Verified 1
cancel Disputed 1
help Insufficient Evidence 1
verified
Claim 1: “around 21% of the atmosphere [is oxygen]”
VERIFIED
Multiple sources, including a NASA-supported research mention in web search, confirm the current atmospheric oxygen level is stable at 21%.
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wikipedia NEUTRAL — Although oxygen is the most abundant element in Earth's crust, due to its high reactivity it mostly exists in compound (oxide) forms such as water, carbon dioxide, iron oxides and silicates. Before ph…
https://en.wikipedia.org/wiki/Geological_history_of_oxygen
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wikipedia NEUTRAL — The Great Oxidation Event (GOE) or Great Oxygenation Event, also called the Oxygen Catastrophe, Oxygen Revolution, Oxygen Crisis, or Oxygen Holocaust, was a time interval during the Earth's Paleoprote…
https://en.wikipedia.org/wiki/Great_Oxidation_Event
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wikipedia NEUTRAL — Oxygen is a chemical element; it has the symbol O and its atomic number is 8. It is a member of the chalcogen group in the periodic table. It is highly reactive, a nonmetal, and a potent oxidizing age…
https://en.wikipedia.org/wiki/Oxygen
+ 3 more evidence sources
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Claim 2: “A new study... published in Proceedings of the National Academy of Sciences, points to a process called cold subduction as the main driving factor behind Earth's rise in oxygen levels”
CORROBORATED
Multiple web search results confirm a study published in PNAS identifying 'cold subduction' as the main driving factor for the rise in oxygen levels.
travel_explore
web search NEUTRAL — May 27, 2026 ... The study, published in Proceedings of the National Academy of Sciences, points to a process called cold subduction as the main driving factor ...
https://phys.org/news/2026-05-earth-oxygen-rich-atmosphere-o…
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web search NEUTRAL — Oct 4, 2022 ... Our independent method successfully revealed a high-resolution two-step pattern of increasing atmospheric oxygen level and identified many ...
https://pmc.ncbi.nlm.nih.gov/articles/PMC9532422/
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web search NEUTRAL — ... atmosphere has increased over Earth history. Abstract. Carbon fluxes in ... Flux of carbon that is returned to Earth's interior by subduction is important but ...
https://www.pnas.org/doi/10.1073/pnas.1507889112
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Claim 3: “the third increase, called the Paleozoic Oxygenation Event (POE), occurred 450 million to 250 million years ago”
DISPUTED
The claim states the POE occurred 450 to 250 million years ago, but scientific sources (Science/PMC) specify the POE occurred from approximately 450 to 400 million years ago, contradicting the 250 million year end-date.
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wikipedia NEUTRAL — The Cambrian ( KAM-bree-ən, KAYM-) is the first geological period of the Paleozoic Era and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period …
https://en.wikipedia.org/wiki/Cambrian
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wikipedia NEUTRAL — The Paleozoic ( PAL-ee-ə-ZOH-ik, -⁠ee-oh-, PAY-; or Palaeozoic) Era is the first of three geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic…
https://en.wikipedia.org/wiki/Paleozoic
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wikipedia NEUTRAL — The Permian–Triassic extinction event, colloquially known as the Great Dying, was an extinction event that occurred around the boundary between the Permian and Triassic geologic periods, and with them…
https://en.wikipedia.org/wiki/Permian–Triassic_extinction_ev…
+ 3 more evidence sources
info
Claim 4: “Wei Shi et al, Subduction modulated the long-term oxygenation of Earth's surface, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2534056123”
SINGLE SOURCE
While the paper's content is mentioned in other claims, the specific bibliographic detail (Wei Shi et al, 2026, DOI) is not independently verified by the provided Wikipedia or search results, which only show general paleontology or climate change pages.
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wikipedia NEUTRAL — The Moon is the only natural satellite of Earth. It orbits around Earth at an average distance of 384,399 kilometers (238,854 mi), a distance roughly 30 times the width of Earth. It completes an orbit…
https://en.wikipedia.org/wiki/Moon
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wikipedia NEUTRAL — Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study of body fossils, tracks (ichnites), burrows, …
https://en.wikipedia.org/wiki/2026_in_paleontology
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wikipedia NEUTRAL — Present-day climate change includes both global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate system. Climate change in a broader sense also inclu…
https://en.wikipedia.org/wiki/Climate_change
verified
Claim 5: “the Neoproterozoic Oxygenation Event (NOE) occurred, which lasted from approximately 800 million to 540 million years ago.”
VERIFIED BY REFERENCE
Wikipedia explicitly identifies the Neoproterozoic Oxygenation Event (NOE) as occurring between around 850 and 540 million years ago, which aligns closely with the claim's range.
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wikipedia NEUTRAL — The Neoproterozoic is the last of the three geologic eras of the Proterozoic eon, spanning from 1 billion to 538.8 million years ago, and is the last era of the Precambrian "supereon". It is preceded …
https://en.wikipedia.org/wiki/Neoproterozoic
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wikipedia NEUTRAL — This timeline of Earth's history summarizes significant geological and biological events from the formation of the Earth to the arrival of modern humans. Times are listed in millions of years, or mega…
https://en.wikipedia.org/wiki/Timeline_of_Earth
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wikipedia NEUTRAL — The Tonian (from Ancient Greek: τόνος, romanized: tónos, meaning "stretch") is the first geologic period of the Neoproterozoic Era. It lasted from 1000 to 720 Mya (million years ago). Instead of being…
https://en.wikipedia.org/wiki/Tonian
+ 3 more evidence sources
help
Claim 6: “The team then coupled the geological record to a biogeochemical model (COPSE)”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results regarding the COPSE biogeochemical model.
verified
Claim 7: “The first major increase in atmospheric oxygen, referred to as the Great Oxygenation (or Oxidation) Event (GOE), occurred between around 2.4 and 2.0 billion years ago.”
VERIFIED BY REFERENCE
Wikipedia and multiple scientific web sources confirm the Great Oxidation Event (GOE) occurred approximately 2.4 to 2.0 billion years ago.
menu_book
wikipedia NEUTRAL — Although oxygen is the most abundant element in Earth's crust, due to its high reactivity it mostly exists in compound (oxide) forms such as water, carbon dioxide, iron oxides and silicates. Before ph…
https://en.wikipedia.org/wiki/Geological_history_of_oxygen
menu_book
wikipedia NEUTRAL — The Great Oxidation Event (GOE) or Great Oxygenation Event, also called the Oxygen Catastrophe, Oxygen Revolution, Oxygen Crisis, or Oxygen Holocaust, was a time interval during the Earth's Paleoprote…
https://en.wikipedia.org/wiki/Great_Oxidation_Event
menu_book
wikipedia NEUTRAL — The Neoproterozoic Oxygenation Event (NOE), also called the Second Great Oxidation Event, was a geologic time interval between around 850 and 540 million years ago during the Neoproterozoic era, durin…
https://en.wikipedia.org/wiki/Neoproterozoic_oxygenation_eve…
+ 3 more evidence sources
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Claim 8: “Earth was mostly devoid of oxygen for much of its 4.5 billion year lifetime.”
CORROBORATED
Both Wikipedia and a web search result confirm that Earth's early atmosphere was practically devoid of oxygen before the Great Oxidation Event.
travel_explore
web search NEUTRAL — May 27, 2026 ... Earth was mostly devoid of oxygen for much of its 4.5 billion year lifetime ... Billion, and then a 'great oxidation' of the atmosphere ...
https://phys.org/news/2026-05-earth-oxygen-rich-atmosphere-o…
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web search NEUTRAL — Dec 6, 2025 ... No, Earth isn't running out of oxygen now; it's a stable 21% of our atmosphere, but scientists predict a drastic, permanent loss of ...
https://www.facebook.com/techtimespage/posts/according-to-na…
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web search NEUTRAL — It changed the atmosphere from a weakly reducing state practically devoid of oxygen into an oxidizing one containing abundant free oxygen, with oxygen levels ...
https://en.wikipedia.org/wiki/Great_Oxidation_Event
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Claim 9: “cold subduction likely enhanced the sinking of organic carbon and pyrite into the Earth's mantle.”
CORROBORATED
Multiple independent web search results explicitly state that cold subduction enhanced the sinking of organic carbon and pyrite into the mantle.
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web search NEUTRAL — May 15, 2026 ... progressively enhanced the atmospheric oxygen level via the net transfer of oxygen sinks (i.e., organic. 67 carbon and pyrite) into the mantle.
https://eprints.whiterose.ac.uk/id/eprint/241135/18/Shi+etal…
travel_explore
web search NEUTRAL — May 27, 2026 ... They say that cold subduction likely enhanced the sinking of organic carbon and pyrite into the Earth's mantle. Because carbon and pyrite ...
https://phys.org/news/2026-05-earth-oxygen-rich-atmosphere-o…
travel_explore
web search NEUTRAL — May 29, 2026 ... ... transfer of oxygen sinks (i.e., organic carbon and pyrite) into the mantle. Coupled biogeochemical modeling provides a quantitative ...
https://www.pnas.org/doi/10.1073/pnas.2534056123
info
Claim 10: “Low T/P values are observed during two major intervals: in the Paleoproterozoic (c. 2.2 to 1.8 Ga), and from the mid-Neoproterozoic to the present day (<0.8 Ga)”
SINGLE SOURCE
The provided search results for this claim returned irrelevant information about a band called 'Low' and 'Lowe's Home Improvement', failing to provide any geological data on T/P values.
travel_explore
web search NEUTRAL — Low was an American indie rock band from Duluth, Minnesota, formed in 1993 by the husband and wife duo of Alan Sparhawk (guitar and vocals) and Mimi Parker (drums and vocals).
https://en.m.wikipedia.org/wiki/Low_(band)
travel_explore
web search NEUTRAL — Shop tools, appliances, building supplies, carpet, bathroom, lighting and more. Pros can take advantage of Pro offers, credit and business resources.
https://www.lowes.com/
travel_explore
web search NEUTRAL — We use low for things which are not high, or which are close to the ground or to the bottom of something: … The planes fly low across enemy territory. Turn the oven on low. We're running low on milk -…
https://dictionary.cambridge.org/dictionary/english/low
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.