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the claim

Global mean sea level has risen by roughly 20 centimetres since 1900.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
7 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that global mean sea level has risen by roughly 20 centimetres since 1900?

Yes. A NASA-led study reports sea levels rose on average 1.6 mm per year between 1900 and 2018, which over 118 years totals roughly 19 centimetres, and a peer-reviewed EGU abstract reports about 1.5 mm per year since 1900, consistent with roughly 20 centimetres. Several other studies confirm global mean sea level has risen since 1900 without stating the total magnitude.

Verdict: SUPPORTED · 7 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 7
NASA-led study reveals the causes of sea level rise since 1900 – NASA Sea Level Change Portal
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NASA-led study reveals the causes of sea level rise since 1900 – NASA Sea Level Change Portal. (n.d.). sealevel.nasa.gov. https://sealevel.nasa.gov/news/191/nasa-led-study-reveals-the-causes-of-sea-level-rise-since-1900/

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More for · 6
Distinguishing between regression model fits to global mean sea level reconstructions
2021
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Distinguishing between regression model fits to global mean sea level reconstructions. (2021). pubs.usgs.gov. https://doi.org/10.1029/2021JC017347

The causes of sea-level rise since 1900
2020
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Thomas, F., Felix, L., & Lambert, C. (2020). The causes of sea-level rise since 1900. authors.library.caltech.edu. https://doi.org/10.1038/s41586-020-2591-3

The causes of sea-level rise since 1900
2020
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The causes of sea-level rise since 1900. (2020). doi.org. https://doi.org/10.5194/egusphere-egu2020-7907

Human-driven sea-level rise has tripled the frequency of coastal sea-level extremes since 1900
2025
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Dangendorf, S., Sun, Q., Gamage, P. M. M., Wahl, T., Marcos, M., Marzeion, B., Slangen, A., & Mitrovica, J. (2025). Human-driven sea-level rise has tripled the frequency of coastal sea-level extremes since 1900. doi.org. https://doi.org/10.21203/rs.3.rs-7491013/v1

Evaluation of the Local Sea‐Level Budget at Tide Gauges Since 1958
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Evaluation of the Local Sea‐Level Budget at Tide Gauges Since 1958. (n.d.). cir.nii.ac.jp. https://doi.org/10.1029/2021gl094502

Evaluating Model Simulations of Twentieth-Century Sea Level Rise. Part I: Global Mean Sea Level Change
2017
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Evaluating Model Simulations of Twentieth-Century Sea Level Rise. Part I: Global Mean Sea Level Change. (2017). insu.hal.science. https://doi.org/10.1175/JCLI-D-17-0110.1

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