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The shared socio-economic pathway (SSP) greenhouse gas concentrations and their extensions to 2500
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Abstract
Anthropogenic increases in atmospheric greenhouse gas concentrations are the main driver of current and future climate change. The integrated assessment community has quantified anthropogenic emissions for the shared socio-economic pathway (SSP) scenarios, each of which represents a different future socio-economic projection and political environment. Here, we provide the greenhouse gas concentrations for these SSP scenarios – using the reduced-complexity climate–carbon-cycle model MAGICC7.0. We extend historical, observationally based concentration data with SSP concentration projections from 2015 to 2500 for 43 greenhouse gases with monthly and latitudinal resolution. CO 2 concentrations by 2100 range from 393 to 1135 ppm for the lowest (SSP1-1.9) and highest (SSP5-8.5) emission scenarios, respectively. We also provide the concentration extensions beyond 2100 based on assumptions regarding the trajectories of fossil fuels and land use change emissions, net negative emissions, and the fraction of non-CO 2 emissions. By 2150, CO 2 concentrations in the lowest emission scenario are approximately 350 ppm and approximately plateau at that level until 2500, whereas the highest fossil-fuel-driven scenario projects CO 2 concentrations of 1737 ppm and reaches concentrations beyond 2000 ppm by 2250. We estimate that the share of CO 2 in the total radiative forcing contribution of all considered 43 long-lived greenhouse gases increases from 66 % for the present day to roughly 68 % to 85 % by the time of maximum forcing in the 21st century. For this estimation, we updated simple radiative forcing parameterizations that reflect the Oslo Line-By-Line model results. In comparison to the representative concentration pathways (RCPs), the five main SSPs (SSP1-1.9, SSP1-2.6, SSP2-4.5, SSP3-7.0, and SSP5-8.5) are more evenly spaced and extend to lower 2100 radiative forcing and temperatures. Performing two pairs of six-member historical ensembles with CESM1.2.2, we estimate the effect on surface air temperatures of applying latitudinally and seasonally resolved GHG concentrations. We find that the ensemble differences in the March–April–May (MAM) season provide a regional warming in higher northern latitudes of up to 0.4 K over the historical period, latitudinally averaged of about 0.1 K, which we estimate to be comparable to the upper bound (∼5 % level) of natural variability. In comparison to the comparatively straight line of the last 2000 years, the greenhouse gas concentrations since the onset of the industrial period and this studies' projections over the next 100 to 500 years unequivocally depict a “hockey-stick” upwards shape. The SSP concentration time series derived in this study provide a harmonized set of input assumptions for long-term climate science analysis; they also provide an indication of the wide set of futures that societal developments and policy implementations can lead to – ranging from multiple degrees of future warming on the one side to approximately 1.5 ∘ C warming on the other.
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“A new study [9] provided projections of future UV-radiation for cloud-free conditions based on total column ozone and aerosol optical depth data from six CMIP6 (Coupled Model Intercomparison Project Phase 6) models following four Shared Socio-economic Pathway (SSP) scenarios1 [10], which supersede the RCP scenarios.”
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Procyk, R., Lovejoy, S., & Hébert, R. (2020) · doi:10.5194/esd-2020-48 · Cited by 23
Rathnayake, N., Rathnayake, U., Chathuranika, I. M., Dang, T. L., & Hoshino, Y. (2023) · IEEE Access · doi:10.1109/access.2023.3238717 · Cited by 36
Li, K., Liu, X.-F., Zhang, J.-H., Zhou, X.-L., Yang, L., & Shen, S.-K. (2023) · Forest Ecosystems · doi:10.1016/j.fecs.2023.100124 · Cited by 23
Geyman, B. M., Streets, D., Olson, C., Thackray, C. P., Olson, C. L., Schaefer, K., Krabbenhoft, D., & Sunderland, E. (2025) · Environmental Science and Technology · doi:10.1021/acs.est.4c13434 · Cited by 22
Practical paths towards quantifying and mitigating agricultural methane emissions
Nisbet, E. G., Manning, M., Lowry, D. C., Fisher, R., Lan, X., Michel, S., France, J. L., Nisbet, R. E. R., Bakkaloglu, S., Leitner, S., et al. (2025) · Proceedings of the Royal Society A Mathematical Physical and Engineering Sciences · doi:10.1098/rspa.2024.0390 · Cited by 18
Guo, J., Xiao, D.-Y., Sun, X.-L., Guo, F., Xue, S., & Fan, L.-X. (2024) · Ecological Indicators · doi:10.1016/j.ecolind.2024.112728 · Cited by 22
Abolghasemzadeh, H., Zekri, E., & Nasseri, M. (2024) · Sustainable Cities and Society · doi:10.1016/j.scs.2024.105565 · Cited by 23
Goddard, P. B., Kravitz, B., MacMartin, D. G., Visioni, D., Bednarz, E., & Lee, W. (2023) · Journal of Geophysical Research Atmospheres · doi:10.1029/2023jd039434 · Cited by 29
“5 scenario (Meinshausen et al., 2020) with the sulfate precursor (SO 2 ) injection beginning in January 2035 and continuing through December 2069.”
BackgroundInfluentialTreeGOER: A database with globally observed environmental ranges for 48,129 tree species
Kindt, R. (2023) · Global Change Biology · doi:10.1111/gcb.16914 · Cited by 22
Present and Future of Heavy Rain Events in the Sahel and West Africa
Saley, I. A., & Salack, S. (2023) · Atmosphere · doi:10.3390/atmos14060965 · Cited by 22
An, N., Yao, Q., & Shen, Q. (2022) · Buildings · doi:10.3390/buildings12101614 · Cited by 22
“Although the RCHSCC originated earlier in the year analysis, the high-frequency words mainly appeared in recent years (2013–2016).”
BackgroundStronger decadal variability of the Kuroshio Extension under simulated future climate change
Joh, Y., Delworth, T., Wittenberg, A., Cooke, W., Rosati, A., & Zhang, L.-P. (2022) · npj Climate and Atmospheric Science · doi:10.1038/s41612-022-00285-z · Cited by 22
Oh, J., An, S., Shin, J., & Kug, J. (2022) · Earth s Future · doi:10.1029/2022ef002804 · Cited by 30
“Also, we here performed the somewhat extreme transient CO2 reversibility experiment with a maximum CO2 concentration quadrupled from the present level, which is comparable to the shared socio-economic pathway (SSP) 5–8.5 Scenario (Meinshausen et al., 2020) in the CMIP6 (Eyring et al., 2016).”
BackgroundInfluentialXue, S., Zang, Y., Chen, J., Shang, S., & Tang, X. (2022) · Environmental and Experimental Botany · doi:10.1016/j.envexpbot.2022.104888 · Cited by 24
Canning, A. D., & Waltham, N. J. (2021) · Ecology and Evolution · doi:10.1002/ece3.7412 · Cited by 34
“The SSP 5– 8.5 scenario represents a high impact scenario with high fossil fuel consumption throughout the 21st century (Meinshausen et al., 2020).”
BackgroundInfluentialImpacts of a near-future supersonic aircraft fleet on atmospheric composition and climate
Eastham, S., Fritz, T., Sanz-Morère, I., Prashanth, P., Allroggen, F., Prinn, R. G., Speth, R., & Barrett, S. (2022) · Environmental Science Atmospheres · doi:10.1039/d1ea00081k · Cited by 22
Western, L., Rigby, M., Mühle, J., Krummel, P., Lunder, C., O'Doherty, S., Reimann, S., Vollmer, M., Young, D., Adam, B., et al. (2025) · Earth System Science Data · doi:10.5194/essd-17-6557-2025 · Cited by 21
“Recent emission estimates (within the previous ∼ 2 years) should be treated as preliminary as some of the underlying measurement data may not be fully vetted and/or calibration tanks may not have been returned from the measurement sites to the AGAGE central calibration laboratory for re-calibration…”
Self-citationAmplified seasonality in western Europe in a warmer world
de Winter, N. J., Tindall, J. C., Johnson, A. L. A., Goudsmit, B., Wichern, N., Kaskes, P., Claeys, P., Huygen, F., van Leeuwen, S. M., Metcalfe, B., et al. (2024) · Science Advances · doi:10.1126/sciadv.adl6717 · Cited by 23
Particulate Nitrate Photolysis as a Possible Driver of Rising Tropospheric Ozone
Shah, V. P., Keller, C. A., Knowland, K. E., Christiansen, A., Hu, L., Wang, H., Lu, X. H., Alexander, B., & Jacob, D. J. (2024) · Geophysical Research Letters · doi:10.1029/2023gl107980 · Cited by 34
Quan, H., Wang, B., Wu, L.-H., Feng, H., Wu, L.-N., Wu, L.-H., Liu, D., & Siddique, K. (2024) · Agriculture, Ecosystems & Environment · doi:10.1016/j.agee.2023.108838 · Cited by 21
Jha, P. K., Beebe, S. E., Alvarez, P., Mukankusi, C. M., & Ramírez-Villegas, J. (2023) · Agricultural and Forest Meteorology · doi:10.1016/j.agrformet.2023.109735 · Cited by 23
“Atmospheric CO 2 concentration input into the crop model for the SSPs 1 – 2.6, 2 – 4.5, 3 – 7.0, and 5 – 8.5 for the 2030 (2050) periods were 440 (469), 446 (508), 454 (544), and 456 (569) parts per million respectively (Meinshausen et al., 2020).”
BackgroundInfluentialHou, W., Zhang, X., Deng, H., Zhang, X., Wu, M., Qin, T., Li, X., Yan, D., Yi, B., Ta, W., et al. (2023) · Resources Conservation and Recycling · doi:10.1016/j.resconrec.2023.106939 · Cited by 23
On the climatic influence of CO2 forcing in the Pliocene
Burton, L. E., Haywood, A., Tindall, J., Dolan, A., Hill, D., Abe-Ouchi, A., Chan, W., Chandan, D., Feng, R., Hunter, S., et al. (2023) · Climate of the Past · doi:10.5194/cp-19-747-2023 · Cited by 21
Advancing the potential impact of future scenarios by integrating psychological principles
Richter, I., Gabe‐Thomas, E., Queirós, A. M., Sheppard, S. R. J., & Pahl, S. (2022) · Environmental Science & Policy · doi:10.1016/j.envsci.2022.11.015 · Cited by 34
Optimization of the Design of an Agrophotovoltaic System in Future Climate Conditions in South Korea
Kim, S., & Kim, S. (2023) · Social Science Research Network · doi:10.2139/ssrn.4088352 · Cited by 21
Gädeke, A., Wortmann, M., Menz, C., Islam, A., Masood, M., Krysanova, V., Lange, S., & Hattermann, F. (2022) · Environmental Research Letters · doi:10.1088/1748-9326/ac8ca1 · Cited by 21
Pascoe, E., Nava, S., Labruna, M., Paddock, C., Levin, M., Marcantonio, M., & Foley, J. (2022) · PLoS ONE · doi:10.1371/journal.pone.0271683 · Cited by 21
The Potential Impact of a Clean Energy Society on Air Quality
Sanyal, S., & Wuebbles, D. J. (2022) · Earth s Future · doi:10.1029/2021ef002558 · Cited by 34
CMIP6 simulations with the compact Earth system model OSCAR v3.1
Quilcaille, Y., Gasser, T., Ciais, P., & Boucher, O. (2022) · Geoscientific Model Development · doi:10.5194/gmd-2021-412 · Cited by 21
“The extensions of scenarios are not those that were initially foreseen (O’Neill et al., 2016) but those that have effectively been used during the CMIP6 exercise (Meinshausen et al., 2020).”
MethodHa, S.-M., Jang, H., Park, C., & Jeong, B. (n.d.) · Renewable & Sustainable Energy Reviews · doi:10.1016/j.rser.2025.116219 · Cited by 21
Global vegetation production may decrease in this century due to rising atmospheric dryness
Lin, S., Chen, X.-Z., Xia, J., Xin, Q., Fu, Z., He, B., Liu, Q.-H., Piao, S., & Yuan, W. (2025) · Nature Ecology & Evolution · doi:10.1038/s41559-025-02885-3 · Cited by 20
“54 under the SSP 1-2.6, SSP 2-4.5, SSP 3-7.0 and SSP 5-8.5 scenarios as GHG forcing in the future prediction (corresponding to Supplementary Fig.”
InfluentialHajima, T., Kawamiya, M., Ito, A., Tachiiri, K., Jones, C. D., Arora, V. K., Brovkin, V., Séférian, R., Liddicoat, S., Friedlingstein, P., et al. (2025) · Biogeosciences · doi:10.5194/bg-22-1447-2025 · Cited by 20
Marine ecosystem role in setting up preindustrial and future climate
Tjiputra, J., Couespel, D., & Sanders, R. (2025) · Nature Communications · doi:10.1038/s41467-025-57371-y · Cited by 20
Low human interest for the most at-risk reef fishes worldwide
Mouquet, N., Langlois, J., Casajus, N., Auber, A., Flandrin, U., Guilhaumon, F., Loiseau, N., McLean, M. J., Receveur, A., Stuart‐Smith, R. D., et al. (2024) · Science Advances · doi:10.1126/sciadv.adj9510 · Cited by 25
“6, representing a future with an emphasis on sustainable development and reduced greenhouse gas emissions ( 87 ).”
Schröder, L. S., Rasche, L., Jantke, K., Mishra, G., Lange, S., Eschenbach, A., & Schneider, U. A. (2023) · Land Degradation & Development · doi:10.1002/ldr.4944 · Cited by 20
“For further information on model setup, including scenario-specific CO 2 concentrations (Meinshausen et al., 2020) applied per simulation period, we provide a detailed documentation in the Supplementary Material (A1 – A4).”
MethodUnderstanding pattern scaling errors across a range of emissions pathways
Wells, C., Jackson, L., Maycock, A., & Forster, P. (2023) · Earth System Dynamics · doi:10.5194/esd-14-817-2023 · Cited by 20
Levy, R., Naish, T., Lowry, D., Priestley, R. K., Winefield, R., Alevropolous-Borrill, A., Beck, E., Bell, R., Blick, G., Dadić, R., et al. (2023) · Journal of the Royal Society of New Zealand · doi:10.1080/03036758.2023.2232743 · Cited by 20
“A ‘ Sea-level rise ’ button leads to information about sea-level rise, VLM, and the IPCC shared socio-economic pathways (Meinshausen et al. 2020).”
BackgroundInfluentialZhang, J., Hu, Y.-Y., Zhu, C., Flögel, S., Fang, X., & Sun, J.-M. (2023) · Palaeogeography, Palaeoclimatology, Palaeoecology · doi:10.1016/j.palaeo.2023.111541 · Cited by 20
Sharma, J., Singh, R., Garai, S., Rahaman, S. M., Khatun, M., Ranjan, A., Mishra, S. N., & Tiwari, S. (2022) · Ecological Informatics · doi:10.1016/j.ecoinf.2022.101824 · Cited by 34
Chen, Y., Ji, D., Zhang, Q., Moore, J. C., Boucher, O., Jones, A., Lurton, T., Mills, M. J., Niemeier, U., Séférian, R., et al. (2023) · Earth System Dynamics · doi:10.5194/esd-14-55-2023 · Cited by 19
Beier, F., Dietrich, J. P., Heinke, J., Abrahão, G. M., von Jeetze, P., Bodirsky, B. L., Crawford, M., Humpenöder, F., Merfort, L., Weindl, I., et al. (2025) · The Lancet Planetary Health · doi:10.1016/s2542-5196(25)00087-7 · Cited by 31
“These general trends and the direction of change of supply-side and demand-side, land-based mitigation measures are robust across varying socioeconomic assumptions in MAgPIE (the sensitivity analysis is provided in appendix 1 [pp 13–14, 27–30]).”
Interplay between climate and carbon cycle feedbacks could substantially enhance future warming
Kaufhold, C., Willeit, M., Talento, S., Ganopolski, A., & Rockström, J. (2025) · Environmental Research Letters · doi:10.1088/1748-9326/adb6be · Cited by 19
“5, the model simulates higher atmospheric CH 4 levels than Meinshausen et al (2020) because we not only account for anthropogenic CH 4 emissions, but also increases in natural emissions from wetlands as a response to increasing vegetation productivity and rising soil temperatures.”
InfluentialHsiao, S.-C., Fu, H.-S., Wu, H.-L., Liang, T., Chang, C.-H., Chen, Y.-M., Lin, L.-Y., & Chen, W.-B. (2024) · Journal of Hydrology: Regional Studies · doi:10.1016/j.ejrh.2024.101921 · Cited by 19
Metadata
- Authors
- Meinshausen, M., Nicholls, Z. R. J., Lewis, J., Gidden, M. J., Vogel, E., Freund, M., Beyerle, U., Gessner, C., Nauels, A., Bauer, N., Canadell, J. G., Daniel, J. S., John, A., Krummel, P. B., Luderer, G., Meinshausen, N., Montzka, S. A., Rayner, P. J., Reimann, S., Smith, S. J., van den Berg, M., Velders, G. J. M., Vollmer, M. K., & Wang, R. H. J.
- Affiliations
- The University of Melbourne (AU)
- International Institute for Applied Systems Analysis (AT)
- Commonwealth Scientific and Industrial Research Organisation (AU)
- ETH Zurich (CH)
- Potsdam Institute for Climate Impact Research (DE)
- CSIRO Oceans and Atmosphere (AU)
- NOAA Chemical Sciences Laboratory (US)
- National Oceanic and Atmospheric Administration (US)
- Empa (CH)
- Joint Global Change Research Institute (US)
- Utrecht University (NL)
- Georgia Institute of Technology (US)
- Corresponding author
- Meinshausen, Malte
- Gidden, Matthew J.
- Vogel, Elisabeth
- Beyerle, Urs
- Gessner, Claudia
- Nauels, Alexander
- Canadell, Josep G.
- Krummel, Paul B.
- Luderer, Gunnar
- Montzka, Stephen A.
- Rayner, Peter J.
- Reimann, Stefan
- Smith, Steven J.
- Velders, Guus J. M.
- Vollmer, Martin K.
- Wang, Ray H. J.
- ORCID
- Meinshausen, Malte
- Nicholls, Zebedee R. J.
- Lewis, Jared
- Gidden, Matthew J.
- Vogel, Elisabeth
- Freund, Mandy
- Beyerle, Urs
- Gessner, Claudia
- Nauels, Alexander
- Bauer, Nico
- Canadell, Josep G.
- Daniel, John S.
- John, Andrew
- Krummel, Paul B.
- Luderer, Gunnar
- Montzka, Stephen A.
- Rayner, Peter J.
- Reimann, Stefan
- Smith, Steven J.
- van den Berg, Marten
- Velders, Guus J. M.
- Vollmer, Martin K.
- Wang, Ray H. J.
- Venue
- Geoscientific Model Development
- Publisher
- Copernicus GmbH
- Published
- 2020-08-13
- Volume
- 13
- Issue
- 8
- Pages
- 3571-3605
- ISSN
- 1991-959X (ISSN-L)
- 1991-9603
- OpenAlex
- W3048501727
- Cited by
- 1,815
- References
- 78
- Citations by year
- 2026: 288 · 2025: 412 · 2024: 396 · 2023: 336 · 2022: 241 · 2021: 107 · 2020: 33
- FWCI
- 66.93
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Geoscientific model development (publishedVersion, cc-by)
- Minerva Access (University of Melbourne) (submittedVersion, cc-by-sa)
- IIASA PURE (International Institute of Applied Systems Analysis) (submittedVersion, cc-by-sa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- DORA Empa (Swiss Federal Laboratories for Materials Science and Technology (Empa)) (submittedVersion, cc-by)
- Utrecht University Repository (Utrecht University) (submittedVersion, other-oa)
- NOAA Institutional Repository (submittedVersion)
- RENATE (submittedVersion, cc-by-nc-nd)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Publication Database PIK (Potsdam Institute for Climate Impact Research (PIK)) (submittedVersion, other-oa)
- Rivm (National Institute for Public Health and the Environment) (submittedVersion)
- Repository for Publications and Research Data (ETH Zurich) (submittedVersion, cc-by)
- Rivm (National Institute for Public Health and the Environment) (submittedVersion, other-oa)
- RENATE (cc-by)
- ETH Zürich Research Collection (cc-by)
- Funders
- Australian Research Council (FT130100809)
- Topics
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate variability and models
- Social Sciences › Economics, Econometrics and Finance › Economics and Econometrics › Climate Change Policy and Economics
- Physical Sciences › Environmental Science › Global and Planetary Change › Climate Change and Environmental Impact
- Keywords
- Shared Socioeconomic Pathways, greenhouse gas concentrations, long-lived greenhouse gases, radiative forcing, fossil fuel emissions, land use change emissions, net-negative emissions, non-CO2 emissions, surface air temperature, RCP scenarios
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.
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