Cited by 76Astro and Planetary ScienceEarth Systems and Cosmic EvolutionPlanetary Science and Exploration

Reducing greenhouses and the temperature history of Earth and Mars

SAGAN, CARL·1977·Nature

Integrity signals

Registry

Crossref · 10.1038/269224a0

Cites

21 of 21 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Another proposed early greenhouse gas is H2, if it attained percentage abundances.

    “Another proposed early greenhouse gas is H2, if it attained percentage abundances (14, 217, 218).”

    From The Archean atmosphere (2020) · cites this paper as [217]

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Authors
SAGAN, C.
Affiliations
Cornell University (US)
Corresponding author
SAGAN, CARL
Venue
Nature
Published
1977-09
Volume
269
Issue
5625
Pages
224-226
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2080057237
Cited by
76
References
21
Citations by year
2026: 2 · 2025: 2 · 2024: 4 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 5 · 2019: 3 · 2018: 3 · 2017: 5 · 2016: 1 · 2015: 2 · 2012: 2
FWCI
9.06
Type
journal article
Language
en
Open access
closed
Locations
Nature (publishedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Earth Systems and Cosmic Evolution
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Planetary Science and Exploration
Keywords
greenhouse effect, early Earth atmosphere, ammonia, methane, Mars atmosphere, origin of life, albedo, cosmochemistry

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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