Cited by 662Geology and Paleoclimatology ResearchClimate variability and modelsClimate Change and Environmental Impact

Climate sensitivity, sea level and atmospheric carbon dioxide

Open access
Hansen, James, Sato, Makiko, Russell, Gary, Kharecha, Pushker·2013·Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences

Abstract

Cenozoic temperature, sea level and CO 2 covariations provide insights into climate sensitivity to external forcings and sea-level sensitivity to climate change. Climate sensitivity depends on the initial climate state, but potentially can be accurately inferred from precise palaeoclimate data. Pleistocene climate oscillations yield a fast-feedback climate sensitivity of 3±1 ° C for a 4 W m −2 CO 2 forcing if Holocene warming relative to the Last Glacial Maximum (LGM) is used as calibration, but the error (uncertainty) is substantial and partly subjective because of poorly defined LGM global temperature and possible human influences in the Holocene. Glacial-to-interglacial climate change leading to the prior (Eemian) interglacial is less ambiguous and implies a sensitivity in the upper part of the above range, i.e. 3–4 ° C for a 4 W m −2 CO 2 forcing. Slow feedbacks, especially change of ice sheet size and atmospheric CO 2 , amplify the total Earth system sensitivity by an amount that depends on the time scale considered. Ice sheet response time is poorly defined, but we show that the slow response and hysteresis in prevailing ice sheet models are exaggerated. We use a global model, simplified to essential processes, to investigate state dependence of climate sensitivity, finding an increased sensitivity towards warmer climates, as low cloud cover is diminished and increased water vapour elevates the tropopause. Burning all fossil fuels, we conclude, would make most of the planet uninhabitable by humans, thus calling into question strategies that emphasize adaptation to climate change.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1098/rsta.2012.0294

Cites

152 of 152 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

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?

  • Over the last ∼50 million years, global average surface temperatures steadily decreased from nearly 30°C during the early Eocene to less than 10°C during the most recent Pleistocene glacial epoch.

    “For example, over the last ∼50 million years, global average surface temperatures have steadily decreased from nearly 30°C during the early Eocene (Burke et al. 2018, Hansen et al. 2013) to less than 10°C during the most recent Pleistocene glacial epoch (e.g., Tierney et al. 2020).”

    From The History of Ocean Oxygenation (2022) · cites this paper as Hansen et al. 2013

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

2 of the 154 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Hansen, J., Sato, M., Russell, G., & Kharecha, P.
Affiliations
  • Columbia University (US)
  • Goddard Institute for Space Studies (US)
Corresponding author
Hansen, James
Venue
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Published
2013-10-28
Volume
371
Issue
2001
Pages
20120294
ISSN
  • 1364-503X (ISSN-L)
  • 1471-2962
OpenAlex
W2143037254
Cited by
660
References
154
Citations by year
2026: 17 · 2025: 57 · 2024: 62 · 2023: 71 · 2022: 74 · 2021: 67 · 2020: 80 · 2019: 58 · 2018: 45 · 2017: 42 · 2016: 43 · 2015: 20 · 2014: 17 · 2013: 7
FWCI
18.90
Type
journal article
Language
en
Open access
Locations
  • Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • NASA STI Repository (National Aeronautics and Space Administration) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
  • Physical Sciences › Environmental Science › Global and Planetary Change › Climate Change and Environmental Impact
Keywords
climate sensitivity, atmospheric CO2, Cenozoic climate, Pleistocene climate oscillations, Last Glacial Maximum, Holocene warming, Eemian interglacial, ice sheet response, low cloud cover, water vapor, tropopause, fossil fuel combustion, habitability

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 ›

Are you an author, or do you see a problem with this page? Request a review