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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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InfluentialPhoeurn, C. A., Degré, A., Oeurng, C., & Ket, P. (2024) · Environmental Monitoring & Assessment · doi:10.1007/s10661-024-13363-x · Cited by 4
“These scenarios cover two out of the four primary greenhouse gas emissions pathways referred to as Shared Socioeconomic Path-ways (SSPs) (Meinshausen et al., 2020; O’Neill et al., 2016).”
Donald, H. K., Swann, G. E. A., Rae, J., & Foster, G. (2024) · Paleoceanography and Paleoclimatology · doi:10.1029/2024pa004968 · Cited by 4
Cruz, T. M. P., Buchmann, S. L., & Prudic, K. (2024) · Insects · doi:10.3390/insects15100793 · Cited by 4
“…represents a future with increased global warming of 3 ◦ C and radiative forcing of 4.5 W/m 2 by the year 2100, given the current economic The data contain the average minimum temperature (°C), average maximum temperature (°C) and average total precipitation (mm) for each month. trends [4,63,64].”
BackgroundInfluentialKolanowska, M. (2024) · Scientific Reports · doi:10.1038/s41598-024-73248-4 · Cited by 5
Bravo-García, J., Camarillo-Naranjo, J., Blanco-Velázquez, F. J., González-Peñaloza, F., & Anaya-Romero, M. (2024) · Frontiers of Biogeography · doi:10.21425/fob.17.136222 · Cited by 4
Influence of Protected Areas in the Carbon Cycle: A Machine Learning Approach for Future Forecasting
Lago-González, P., Acuña-Alonso, C., & Álvarez, X. (2024) · Earth Systems and Environment · doi:10.1007/s41748-024-00451-8 · Cited by 4
Tadios-Ayson, A. H., Moran, C., & Dagamac, N. H. (2024) · Vegetos- An International Journal of Plant Research · doi:10.1007/s42535-024-01001-3 · Cited by 4
“Additionally, conducting comparative analyses of various emission scenarios is recommended to assess differences in predictive accuracy (Meinshausen et al. 2020; Sharma et al. 2022a).”
Mazaheri, E., Koupai, J. A., Heidarpour, M., Zareian, M., & Gohari, A. (2024) · Theoretical and Applied Climatology · doi:10.1007/s00704-024-05064-9 · Cited by 4
“4-os, and SSP x–y (1–2.0) (O'Neill et al. 2017; Rogelj et al. 2018; Estoque et al. 2020; Meinshausen et al. 2020).”
InfluentialQuaglia, I., Visioni, D., Bednarz, E., MacMartin, D. G., & Kravitz, B. (2024) · Geophysical Research Letters · doi:10.1029/2023gl107702 · Cited by 9
“The volcanic eruptions and SAI are simulated under the Shared Socioeconomic Pathway 2–4.5 (Meinshausen et al., 2020) (SSP2‐4.5) as a background greenhouse gas and anthropogenic aerosols emission scenario (Mac-Martin et al., 2022).”
MethodInfluentialKuprin, A., Shevchenko, N., & Baklanova, V. (2024) · Forests · doi:10.3390/f15040598 · Cited by 4
Global Warming Drives Expansion of Endangered Spruce Forest on the Tibetan Plateau
Zhang, H., Yuan, H., Zou, H., Zhu, X., Zhang, Y., Wang, Z.-Y., & Liu, Z. (2024) · Sustainability · doi:10.3390/su16052164 · Cited by 4
Sullivan, M. R., Primeau, F., Hagstrom, G., Wang, W., & Martiny, A. (2024) · Global Biogeochemical Cycles · doi:10.1029/2023gb007986 · Cited by 4
“Current emissions scenarios project p CO 2 values between 393 and 1,135 ppm by 2100 (i.e., up to > 800 ppm higher than the preindustrial steady state atmospheric CO 2 concentration of 278 ppm) (Meinshausen et al., 2020).”
BackgroundOliveira, J. S., Santana, D., Pantoja, D., Ceron, K., & Guedes, T. B. (2024) · Journal of Arid Environments · doi:10.1016/j.jaridenv.2023.105117 · Cited by 4
Jager, H., Manning, K., Welch, J. N., Corsi, F., Miara, A., Yoon, H. S., McManamay, R., Kao, S.-C., Kusnierz, P. C., & Gangrade, S. (2024) · Ecological Indicators · doi:10.1016/j.ecolind.2024.111755 · Cited by 4
A drier Orinoco basin during the twenty-first century: the role of the Orinoco low-level jet
Correa, I. C., Arias, P. A., Vieira, S. C., & Martínez, J. A. (2024) · Climate Dynamics · doi:10.1007/s00382-023-07028-7 · Cited by 5
“5, which correspond to low, intermediate, and high GHG emission scenarios, respectively (Riahi et al. 2017; Meinshausen et al. 2020).”
Romdhani, O., Matak, L., & Momen, M. (2024) · Weather and Climate Extremes · doi:10.1016/j.wace.2024.100645 · Cited by 4
Dhomse, S., & Chipperfield, M. (2023) · Earth System Science Data · doi:10.5194/essd-15-5105-2023 · Cited by 4
Physically based equation representing the forcing-driven precipitation in climate models
Lee, D., Sparrow, S., Min, S.-K., Yeh, S., & Allen, M. (2023) · Environmental Research Letters · doi:10.1088/1748-9326/acf50f · Cited by 4
Almeida, A., Delgado, F., Roque, N., Ribeiro, M., & Fernandez, P. (2023) · Plants · doi:10.3390/plants12162914 · Cited by 4
“The results showed that climate change considering the Shared Socioeconomic Pathways SSP3-7 scenario, a medium-high reference scenario within the socioeconomic family [38], will not affect the range of the species.”
BackgroundGoicolea, T., Lewison, R. L., Mateo-Sánchez, M. C., & Jennings, M. K. (2023) · Biological Invasions · doi:10.1007/s10530-023-03128-x · Cited by 4
Viana, J. P. C., Lopes-da-Silva, M., Viana, M., & Tidon, R. (2023) · Neotropical Entomology · doi:10.1007/s13744-023-01042-4 · Cited by 4
“…the optimistic SSP1‑2.6 predicts a constant drop in CO 2 emissions, which will reach 0 giga‑ tons before 2080, and the pessimistic SSP5‑8.5 assumes that CO 2 emissions will reach 120 gigatons before 2080 (additional information about these scenarios can be found in Meinshausen et al. 2020).”
BackgroundInfluentialSuitability of Natura 2000 sites for threatened freshwater species under projected climate change
Basen, T., Chucholl, C., Oexle, S., Ros, A., & Brinker, A. (2022) · Aquatic conservation · doi:10.1002/aqc.3899 · Cited by 4
“Projected end-of-century global mean surface air temperature rises relative to 1750 are 1.6 (1.0–2.4), 3.8 (2.6–5.7) and 5.0 (3.3–7.6) K for SSP126, SSP370 and SSP585, respectively (Meinshausen et al., 2020).”
BackgroundMethodInfluentialAn Integrated Approach for Evaluating Climate Change Risks: A Case Study in Suriname
Antich-Homar, H., Hess, K., Solaun, K., Alleng, G. P., & Flores, A. (2022) · Sustainability · doi:10.3390/su14031463 · Cited by 4
Andres, S. E., Powell, J., Emery, N., Rymer, P., & Gallagher, R. (2021) · Global Ecology and Conservation · doi:10.1016/j.gecco.2021.e01862 · Cited by 4
Kleinen, T., Gromov, S., Steil, B., & Brovkin, V. (2021) · Environmental Research Letters · doi:10.1088/1748-9326/ac2f66 · Cited by 4
Robles, M. E. L., Oh, Y., Haque, M. T., Uy, M. J., Mueca, C. C., & Kim, L. (2026) · Environmental impact assessment review · doi:10.1016/j.eiar.2025.108250 · Cited by 4
Yuan, Q., Zhong, W.-J., Yang, Q.-Q., Peng, Y., Bolch, T., Wang, Y., Yue, L., Shen, H.-F., & Zhang, L.-P. (2025) · The Innovation Geoscience · doi:10.59717/j.xinn-geo.2024.100118 · Cited by 4
Kenar, N., & Kikvidze, Z. (2023) · Botanica Serbica · doi:10.2298/botserb2302215k · Cited by 4
“5 is a pessimistic scenario which projects a radiative forcing level of 8.5 W/m² by the year 2100 and is based on the rapid and unconstrained growth in economic output and energy consumption with the highest greenhouse gas emissions (Meinshausen et al. 2020).”
BackgroundInfluentialShort-lived halogen sources and chemistry in the Community Earth System Model v2 (CESM2-SLH)
Fernández, R. P., Cuevas, C. A., Villamayor, J., Feinberg, A. I., Kinnison, D. E., Vitt, F. M., Bossolasco, A. G., Barrera, J. A., Reynoso, A., Tomazzeli, O. G., et al. (2026) · Geoscientific model development · doi:10.5194/gmd-19-9325-2026 · Cited by 13
Heterogeneous future Arctic Ocean primary productivity changes projected in CMIP6
Champiot-Bayard, L., Kwiatkowski, L., & Vancoppenolle, M. (2026) · Biogeosciences · doi:10.5194/bg-23-4735-2026 · Cited by 3
Overshoot and (ir)reversibility to 2300 in two CO 2 -emissions driven Earth System models
Smith, C., Ramme, L., Wells, C. D., Gjermundsen, A., Li, H.-M., Ilyina, T., Muralidhar, A., Bourgeois, T., Schwinger, J., Romero-Prieto, A., et al. (2026) · Earth System Dynamics · doi:10.5194/esd-17-893-2026 · Cited by 3
“2-LR and 2 The ESMs are forced with the CO 2 emission pathways used in the SSP scenarios, extended after the year 2100 as described in Meinshausen et al. (2020) Figure 2 shows the prescribed evolution of fossil fuel and industrial CO 2 emissions in both models .”
Rethinking energy transition strategies for the European Union amid rising energy prices
Meng, W.-J., Nieto, J., Guan, D.-B., Meng, J., Sander, R., Pöschl, U., Hubacek, K., Su, H., Tao, S.-H., & Cheng, Y.-F. (2026) · Proceedings of the National Academy of Sciences of the United States of America · doi:10.1073/pnas.2609606123 · Cited by 3
“VSLs are scaled to GDP per capita from the shared socioeconomic pathway SSP2 projections (73) and converted to EUR in 2021 with International Monetary Fund (IMF) inflation rates (74).”
Curasi, S. R., Melton, J. R., Humphreys, E. R., Arora, V. K., Beaver, J., Cannon, A. J., Chen, J. M., Hermosilla, T., Lee, S., & Wulder, M. A. (2026) · Global Change Biology · doi:10.1111/gcb.70958 · Cited by 2
We Are in the Anthropocene—Now What?
Rockström, J., Martin, M. A., Ganopolski, A., Donges, J. F., Feulner, G., Marwan, N., & Rahmstorf, S. (2026) · Earth s Future · doi:10.1029/2025ef007730 · Cited by 9
“To that end, we apply the extended version (Meinshausen et al., 2020) of two Shared Socioeconomic Pathways (SSPs) called “SSP1—Sustainability” and “SSP2‐Middle of the Road.””
Future changes in seasonal sea-level variability could reshape coastal ecosystems
Hermans, T., Fivash, G., & van Belzen, J. (2026) · Nature Climate Change · doi:10.1038/s41558-026-02631-y · Cited by 3
“0) 17 , the range of the annual cycle will increase by several centimetres in most coastal regions 9 .”
Fu, Z., Qiu, B.-F., Zhang, S., Ma, Y., & Wang, T.-L. (2026) · Journal of Cleaner Production · doi:10.1016/j.jclepro.2026.148510 · Cited by 3
ZHANG, X., Wang, F., ZHENG, J., Li, S., & Ge, Q. (2026) · Science China Earth Sciences · doi:10.1007/s11430-025-1877-y · Cited by 3
“Variables such as GHG concentrations and land-use change were typically prescribed as boundary conditions in climate models (Hurtt et al., 2020; Li, 2020; Meinshausen et al., 2020).”
Rahaman, K. M. A., Islam, A. K. M. S., Hussain, M. A., Islam, G. M. T., Basher, M. A., & Tasnim, Z. (2026) · Journal of Water and Climate Change · doi:10.2166/wcc.2026.256 · Cited by 3
Moyo, M., Akinseye, F. M., van Rooyen, A., Bjørnlund, H., Parry, K., Pittock, J., Ramshaw, P., Mujeyi, A. C., Dube, T., & Dube, F. (2026) · Agricultural Water Management · doi:10.1016/j.agwat.2026.110272 · Cited by 3
Hart, L., Hossaini, R., Wild, O., Mazzeo, A., Halsall, C. J., Hou, X., Wang, Z., Chipperfield, M. P., Arduini, J., Krummel, P. B., et al. (2026) · Geophysical Research Letters · doi:10.1029/2025gl119216 · Cited by 7
“…(Table S1 in Supporting Information S1) and the full range of HFC concentrations projected under the shared socio‐economic pathways reported by Meinshausen et al. (2020), we calculate that TFA production from HFCs in 2050 will be between 6.7 Gg/yr (SSP1‐1.9) and 42.5 Gg/yr (SSP5‐8.5; see…”
InfluentialSelf-citationProjecting nitrous oxide over the 21st century, uncertainty related to stratospheric loss
Prather, M. J., & Wilson, C. P. (2026) · Proceedings of the National Academy of Sciences of the United States of America · doi:10.1073/pnas.2524123123 · Cited by 3
“42) and an IPCC recommended value of –5%.”
InfluentialFeng, G., Wang, J.-W., Xia, L., Lei, Y., Tan, S., Qin, Y.-T., Ji, H.-H., He, P., & Zhang, J.-H. (2026) · Harmful Algae · doi:10.1016/j.hal.2026.103085 · Cited by 3
Life on New Earth: biodiversity change and humanity in a novel future.
Lyon, C., Gordon, J. D., Fagan, B. T., Gillson, L., Hatfield, J., Kabora, T., Martins, I. S., Pettersson, H. L., Redeker, K., Stringer, L. C., et al. (2026) · Philosophical transactions of the Royal Society of London. Series B, Biological sciences · doi:10.1098/rstb.2024.0426 · Cited by 3
Waldmann, P., Eckl, M., Knez, L., Gottschaldt, K.-D., Fiehn, A., Mallaun, C., Gałkowski, M., Kiemle, C., Hutjes, R., Röckmann, T., et al. (2026) · Atmospheric measurement techniques · doi:10.5194/amt-19-185-2026 · Cited by 5
“…relevant in a decarbonized future, as its concentrations will not decrease until the end of this century, even in the most optimistic SSP scenario (Meinshausen et al., 2020 In fact, agriculture is the largest single anthropogenic source of both CH 4 and N 2 O emissions, according to BU and TD…”
InfluentialGoto, D., Yashiro, H., Yamashita, Y., Takigawa, M., Sudo, K., Uchida, J., Yumimoto, K., & Takemura, T. (2026) · Progress in Earth and Planetary Science · doi:10.1186/s40645-025-00791-7 · Cited by 3
“Model evaluation was performed on the basis of observations from 2018, although the emission inventories were from 2015 according to the protocol of the S-20 project by the Environmental Research and Technology Development Fund and the base year of the SSP scenario (Meinshausen et al. 2020).”
Protected areas serve as climate refugia by reducing thermal stress in lizards
Anderson, R. C. O., & Chapple, D. G. (2026) · Biological Conservation · doi:10.1016/j.biocon.2025.111525 · Cited by 3
Tang, G., Zaehle, S., Nicholls, Z., Norton, A., Ziehn, T., & Meinshausen, M. (2026) · Journal of Advances in Modeling Earth Systems · doi:10.1029/2025ms005270 · Cited by 3
“Briefly, we prescribed the land surface global‐mean temperature (derived from the ESM output variable tas) and atmospheric CO 2 concentration (from input4MIPs (Meinshausen et al., 2017, 2020)) to drive CNit.”
Self-citation
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
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