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The shared socio-economic pathway (SSP) greenhouse gas concentrations and their extensions to 2500
Open accessPublished version of a preprint
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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“The prescribed emissions include anthropogenic and biomass burning emissions of NO, CO2 and CO (Rao et al., 2017; Riahi et al., 2017) and the future pathway for CH4 is calculated as an atmospheric concentration (Meinshausen et al., 2020).”
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“To identify highly correlated variables (|r| > 0.74) and minimize the effects of multi-collinearity and model overfitting, the person correlation coefficient method was used [34].”
MethodInfluentialFrequent but Predictable Droughts in East Africa Driven by a Walker Circulation Intensification
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“The moderate SSP245 scenario is based on projections of large increases in sustainable development and 4.5 Wm −2 of radiative forcing by 2100 (Meinshausen et al., 2020).”
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Correcting ozone biases in a global chemistry–climate model: implications for future ozone
Liu, Z., Doherty, R. M., Wild, O., O’Connor, F. M., & Turnock, S. T. (2022) · Atmospheric chemistry and physics · doi:10.5194/acp-22-12543-2022 · Cited by 49
Terhaar, J., Torres, O., Bourgeois, T., & Kwiatkowski, L. (2020) · Biogeosciences · doi:10.5194/bg-2020-456 · Cited by 40
“2), which predominately occur in the Barents Sea (Midttun, 1985; Smedsrud et al., 2013; Terhaar et al., 2020a).”
BackgroundInfluentialGanti, G., Gasser, T., Mai, B., Geden, O., Lamb, W., Minx, J., Schleussner, C., & Gidden, M. (2024) · Communications Earth & Environment · doi:10.1038/s43247-024-01527-z · Cited by 39
Self-citationXiao, Y., Guo, Q.-Q., Xie, N., Yuan, G.-Y., Liao, M., Gui, Q.-S., & Ding, G.-J. (2024) · BMC Ecology and Evolution · doi:10.1186/s12862-024-02234-1 · Cited by 39
“5 Fossil Fuel Pathway [48, 49].”
Emergent constraints on carbon budgets as a function of global warming
Cox, P. M., Williamson, M., Friedlingstein, P., Jones, C. D., Raoult, N., Rogelj, J., & Varney, R. (2024) · Nature Communications · doi:10.1038/s41467-024-46137-7 · Cited by 39
“The implication here is that uncertainties associated with eTCRE differences across models are much larger than the uncertainties associated with the non-CO 2 forcing factors (e.g. aerosols, trace GHGs) and net land-use emissions, all of which differ across the SSP scenarios 24 .”
BackgroundResultSawadogo, W., Neya, T., Semde, I., Korahiré, J. A., Combasséré, A. W., Traoré, D. E., Ouedraogo, P., Diasso, U. J., Abiodun, B. J., Bliefernicht, J., et al. (2024) · Environmental Challenges · doi:10.1016/j.envc.2024.100860 · Cited by 39
Ross, A. C., Stock, C. A. A., Adcroft, A., Curchitser, E., Hallberg, R., Harrison, M., Hedstrom, K. S., Zadeh, N., Alexander, M. A., Chen, W., et al. (2023) · Geoscientific model development · doi:10.5194/gmd-16-6943-2023 · Cited by 58
“5 emissions scenario (Meinshausen et al., 2020).”
MethodWeihs, G. F. F., Jones, J. S., Ho, M., Malik, R., Abbas, A., Meka, W., Fennell, P., & Wiley, D. (2022) · Energy Conversion and Management · doi:10.1016/j.enconman.2022.116406 · Cited by 39
Volume, evolution, and sedimentation of future glacier lakes in Switzerland over the 21st century
Steffen, T., Huss, M., Estermann, R., Hodel, E., & Farinotti, D. (2022) · Earth Surface Dynamics · doi:10.5194/esurf-10-723-2022 · Cited by 39
Is Anthropogenic Global Warming Accelerating?
Jenkins, S., Povey, A. C., Gettelman, A., Grainger, R. G., Stier, P., & Allen, M. R. (2022) · Journal of Climate · doi:10.1175/jcli-d-22-0081.1 · Cited by 80
Liu, Z.-Z., Doherty, R., Wild, O., O'Connor, F., & Turnock, S. (2021) · Atmospheric chemistry and physics · doi:10.5194/acp-2021-689-rc2
Zhu, C.-W., Wolf, J., Zhang, J.-S., Anderegg, W., Bunce, J., & Ziska, L. (2023) · Social Science Research Network · doi:10.2139/ssrn.4386808 · Cited by 37
Increasing Vapor Pressure Deficit Accelerates Land Drying
Li, S., Wang, G.-J., Chai, Y., Miao, L., Hagan, D. F. T., Sun, S.-L., Huang, J., Su, B., Jiang, T., Chen, T.-X., et al. (2023) · Journal of Hydrology · doi:10.1016/j.jhydrol.2023.130062 · Cited by 37
Rebuilding fish biomass for the world's marine ecoregions under climate change
Cheung, W. W. L., Palacios‐Abrantes, J., Frölicher, T. L., Palomares, M. L. D., Clarke, T. M., Lam, V. W. Y., Oyinlola, M. A., Pauly, D. F., Reygondeau, G., Sumaila, U. R., et al. (2022) · Global Change Biology · doi:10.1111/gcb.16368 · Cited by 53
“Projections follow two contrasting scenarios— shared socio- economic pathway (SSP) 1— representative concentration pathway (RCP) 2.6 (SSP1- 2.6) and SSP5- 8.5 (Gütschow et al., 2021; Meinshausen et al., 2020).”
BackgroundInfluentialThe applications of semiconductor materials in air batteries
Yu, Y., & Hu, S.-J. (2021) · doi:10.1016/j.cclet.2021.04.049 · Cited by 37
Warming Patterns Affect El Niño Diversity in CMIP5 and CMIP6 Models
Freund, M. B., Brown, J. R., Henley, B. J., Karoly, D. J., & Brown, J. N. (2020) · Journal of Climate · doi:10.1175/jcli-d-19-0890.1 · Cited by 48
Self-citationThe Turning Point of the Aerosol Era
Bauer, S. E., Tsigaridis, K., Faluvegi, G., Nazarenko, L., Miller, R., Kelley, M., & Schmidt, G. (2022) · Journal of Advances in Modeling Earth Systems · doi:10.1029/2022ms003070 · Cited by 36
“The future scenario emissions are based on (Feng et al., 2020; Gidden et al., 2019; Meinshausen et al., 2020; O’Neill et al., 2016).”
BackgroundAnswer to Christopher Smith and Ben Sanderson
Beusch, L., Nicholls, Z., Gudmundsson, L., Hauser, M., Meinshausen, M., & Seneviratne, S. (2021) · Geoscientific Model Development · doi:10.5194/gmd-2021-252-ac1 · Cited by 36
Self-citationInvasion and Extirpation Potential of Native and Invasive Spartina Species Under Climate Change
Borges, F. O., Santos, C. P., Paula, J., Mateos-Naranjo, E., Redondo-Gómez, S., Adams, J., Caçador, I., Fonseca, V., Reis-Santos, P., Duarte, B., et al. (2021) · Frontiers in Marine Science · doi:10.3389/fmars.2021.696333 · Cited by 36
Müller, J., & Joos, F. (2021) · Biogeosciences · doi:10.5194/bg-18-3657-2021 · Cited by 36
“The trend correction was done per grid cell and month and with respect to the end of the time series Scenario CO 2 forcing was adopted from Meinshausen et al. (2020).”
Visioni, D., Bednarz, E. M., MacMartin, D. G., Kravitz, B., & Goddard, P. B. (2023) · Earth's Future · doi:10.1029/2023ef003851 · Cited by 35
“Here we have focused on the amount of cooling that SO2 is chosen to produce, a method that is similar to the scenario exploration under different GHG concentrations in the IPCC scenarios (Meinshausen et al., 2020).”
MethodStark, G., Ma, L., Zeng, Z., Du, W., & Levy, O. (2023) · Global Change Biology · doi:10.1111/gcb.16802 · Cited by 49
“To predict how future warming may affect lizards between 2080 and 2100, we estimated climatic shifts in temperature by assuming the ssp585 emission scenario (Meinshausen et al., 2020).”
BackgroundFeng, M., Peng, S., Wang, Y.-L., Ciais, P., Goll, D., Chang, J.-F., Fang, Y.-T., Houlton, B., Liu, G., Sun, Y., et al. (2023) · Nature Communications · doi:10.1038/s41467-023-38803-z · Cited by 35
The increasingly dominant role of climate change on length of day variations
Shahvandi, M. K., Adhikari, S., Dumberry, M., Mishra, S., & Soja, B. S. (2024) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.2406930121 · Cited by 40
Plant invasion in Mediterranean Europe: current hotspots and future scenarios
Pinna, L. C., Gallien, L., Pollock, L. J., Axmanová, I., Chytrý, M., Malavasi, M., Acosta, A. T. R., Campos, J. A., & Carboni, M. (2024) · Ecography · doi:10.1111/ecog.07085 · Cited by 34
Future drought risks in the Yellow River Basin and suggestions for targeted response
Deng, H.-Y., Yin, Y.-H., Zong, X.-Z., & Yin, M.-J. (2023) · International Journal of Disaster Risk Reduction · doi:10.1016/j.ijdrr.2023.103764 · Cited by 34
Projection of Hot and Cold Extremes in the Amu River Basin of Central Asia using GCMs CMIP6
Salehie, O., bin Ismail, T., Hamed, M., Shahid, S., & Muhammad, M. K. I. (2021) · Stochastic environmental research and risk assessment (Print) · doi:10.1007/s00477-022-02201-6 · Cited by 34
“5 °C global warming restriction target (Meinshausen et al. 2020).”
BackgroundInfluentialStringent mitigation substantially reduces risk of unprecedented near-term warming rates
McKenna, C. M., Maycock, A. C., Forster, P. M. D. F., Smith, C., & Tokarska, K. B. (2020) · Nature Climate Change · doi:10.1038/s41558-020-00957-9 · Cited by 66
Quaglia, I., & Visioni, D. (2024) · Earth System Dynamics · doi:10.5194/esd-15-1527-2024 · Cited by 33
High radiative forcing climate scenario relevance analyzed with a ten-million-member ensemble
Sarofim, M. C., Smith, C., Malek, P., McDuffie, E. E., Hartin, C. A., Lay, C. R., & McGrath, S. M. (2024) · Nature Communications · doi:10.1038/s41467-024-52437-9 · Cited by 59
“Wefollowthelogicdiscussedin Meinshausen et al. 38 to extend SSP-RCP emissions beyond 2100.”
BackgroundMegill, L., Deck, K., & Grewe, V. (2024) · Communications Earth & Environment · doi:10.1038/s43247-024-01423-6 · Cited by 44
“Thescenariosaredevelopedtotestclimatemetricsand havenotbeenevaluatedforreliabilityandaccuracy.”
Enhanced atmospheric oxidation toward carbon neutrality reduces methane’s climate forcing
Liu, M.-X., Song, Y., Matsui, H., Shang, F., Kang, L., Cai, X.-H., Zhang, H.-S., & Zhu, T. (2024) · Nature Communications · doi:10.1038/s41467-024-47436-9 · Cited by 33
“These future CH 4 concentrations have been projected in support of CMIP6 using a much simpli fi ed climate-carbon-cycle model without the consideration of evolution of natural CH 4 emissions in response to climate warming 42 .”
BackgroundMethodCarbon and climate implications of rewetting a raised bog in Ireland
Wilson, D., Mackin, F., Tuovinen, J., Moser, G. M., Farrell, C. A., & Renou‐Wilson, F. (2022) · Global Change Biology · doi:10.1111/gcb.16359 · Cited by 56
Mo, Y.-H., Chen, S., Wu, Z.-F., Tang, J., & Fu, Y. H. (2024) · Earth s Future · doi:10.1029/2023ef003788 · Cited by 32
“…SSP1‐2.6 scenario represents an approximate total radiative forcing level of 2.6 W m 2 by 2100 under the SSP1 socioeconomic pathway, which broadly corresponds to Representative Concentration Pathway (RCP) 2.6 used in the previous generation of climate change scenarios (Meinshausen et al., 2020).”
MethodInfluentialArctic amplification, and its seasonal migration, over a wide range of abrupt CO2 forcing
Liang, Y.-C., Polvani, L., & Mitevski, I. (2022) · npj Climate and Atmospheric Science · doi:10.1038/s41612-022-00228-8 · Cited by 32
The gap between atmospheric nitrogen deposition experiments and reality.
Bebber, D. (2021) · Science of the Total Environment · doi:10.31223/x5x89z · Cited by 32
Mitigating climate change and ozone pollution will improve Chinese food security
Li, S., Gao, Y., Zhang, J. J., Hong, C., Zhang, S., Chen, D., Wild, O., Feng, Z., Xu, Y., Guo, X., et al. (2024) · One Earth · doi:10.1016/j.oneear.2024.12.002 · Cited by 29
Different photovoltaic power potential variations in East and West China
Chen, X., Zhou, C.-H., Tian, Z., Mao, H., Luo, Y., Sun, D., Fan, J.-H., Jiang, L.-G., Deng, J., & Rosen, M. (2023) · Applied Energy · doi:10.1016/j.apenergy.2023.121846 · Cited by 31
Sharp decline in future productivity of tropical reforestation above 29°C mean annual temperature
Nölte, A., Yousefpour, R., Cifuentes, M., & Hanewinkel, M. (2023) · Science Advances · doi:10.1126/sciadv.adg9175 · Cited by 35
Adhikari, P., Lee, Y.-H., Poudel, A., Lee, G., Hong, S., & Park, Y.-S. (2023) · Biology · doi:10.3390/biology12010084 · Cited by 31
“6 K, respectively, relative to 1750 [34].”
Fewer Basins Will Follow Their Budyko Curves Under Global Warming and Fossil‐Fueled Development
Jaramillo, F., Piemontese, L., Berghuijs, W. R., Wang‐Erlandsson, L., Greve, P., & Wang, Z. (2022) · Water Resources Research · doi:10.1029/2021wr031825 · Cited by 40
“This is not surprising as this scenario's inherent land cover changes will modify vegetation and the Earth's surface more than the SSP126 (Meinshausen et al., 2020), with a considerable increase in cropland and a decrease in pastures and forests, which may affect surface evaporation rates (Riahi et…”
Khosravi, Y., & Ouarda, T. B. M. J. (2025) · Communications Earth & Environment · doi:10.1038/s43247-025-02359-1 · Cited by 38
“To address these limitations, ensemble learning approaches have gained attention, especially when combined with high-resolution datasets like CMIP6, to improve prediction accuracy and reduce uncertainty 56 – 59 .”
Baur, S., Nauels, A., Nicholls, Z., Sanderson, B. M., & Schleussner, C. (2023) · Earth System Dynamics · doi:10.5194/esd-14-367-2023 · Cited by 52
“5.3 (Meinshausen et al., 2020).”
InfluentialSelf-citationImpact of bioenergy crop expansion on climate–carbon cycle feedbacks in overshoot scenarios
Melnikova, I., Boucher, O., Cadule, P., Tanaka, K., Gasser, T., Hajima, T., Quilcaille, Y., Shiogama, H., Séférian, R., Tachiiri, K., et al. (2022) · Earth System Dynamics · doi:10.5194/esd-13-779-2022 · Cited by 49
“4-OS is a concentration-driven scenario based on the implementation of SSP5 in the REMIND-MAgPIE integrated assessment model (IAM) (Kriegler et al., 2017; Meinshausen et al., 2020).”
BackgroundMethodManaging for climate and production goals on crop-lands
McClelland, S. C., Bossio, D., Gordon, D. R., Lehmann, J., Hayek, M. N., Ogle, S. M., Sanderman, J., Wood, S., Yang, Y., & Woolf, D. (2025) · Nature Climate Change · doi:10.1038/s41558-025-02337-7 · Cited by 29
“Annual atmospheric CO 2 concentrations over the simulation period, 2016–2100, for SSP3–7.0 were from Meinshausen et al. 50 .”
InfluentialKaye, A. R., Obolski, U., Sun, L.-T., Hart, W., Hurrell, J., Tildesley, M., & Thompson, R. N. (2024) · Lancet Planetary Health · doi:10.1016/s2542-5196(24)00238-9 · Cited by 29
“23 The climate conditions at any future time can be thought of as a random sample from the CESM projections at that time.”
InfluentialFuture land carbon removals in China consistent with national inventory
He, Y. L., Piao, S. L., Ciais, P., Xu, H., & Gasser, T. (2024) · Nature Communications · doi:10.1038/s41467-024-54846-2 · Cited by 30
Increased crossing of thermal stress thresholds of vegetation under global warming
Li, X., Huntingford, C., Wang, K., Cui, J., Xu, H., Kan, F., Anniwaer, N., Yang, H., Peñuelas, J., & Piao, S. L. (2024) · Global Change Biology · doi:10.1111/gcb.17406 · Cited by 33
“Thus, in combination with projections from Earth System Models (ESMs, Meinshausen et al., 2020; O'Neill et al., 2016), we estimated locations where future mean temperatures would become routinely higher (i.e., “the norm”) than such thresholds (see Section 2).”
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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