Net anthropogenic emissions of carbon dioxide (CO2) must approach zero by mid-century (2050) in order to stabilize the global mean temperature at the level targeted by international efforts1,2,3,4,5. Yet continued expansion of fossil-fuel-burning energy infrastructure implies already ‘committed’ future CO2 emissions6,7,8,9,10,11,12,13. Here we use detailed datasets of existing fossil-fuel energy infrastructure in 2018 to estimate regional and sectoral patterns of committed CO2 emissions, the sensitivity of such emissions to assumed operating lifetimes and schedules, and the economic value of the associated infrastructure. We estimate that, if operated as historically, existing infrastructure will cumulatively emit about 658 gigatonnes of CO2 (with a range of 226 to 1,479 gigatonnes CO2, depending on the lifetimes and utilization rates assumed). More than half of these emissions are predicted to come from the electricity sector; infrastructure in China, the USA and the 28 member states of the European Union represents approximately 41 per cent, 9 per cent and 7 per cent of the total, respectively. If built, proposed power plants (planned, permitted or under construction) would emit roughly an extra 188 (range 37–427) gigatonnes CO2. Committed emissions from existing and proposed energy infrastructure (about 846 gigatonnes CO2) thus represent more than the entire carbon budget that remains if mean warming is to be limited to 1.5 degrees Celsius (°C) with a probability of 66 to 50 per cent (420–580 gigatonnes CO2)5, and perhaps two-thirds of the remaining carbon budget if mean warming is to be limited to less than 2 °C (1,170–1,500 gigatonnes CO2)5. The remaining carbon budget estimates are varied and nuanced14,15, and depend on the climate target and the availability of large-scale negative emissions16. Nevertheless, our estimates suggest that little or no new CO2-emitting infrastructure can be commissioned, and that existing infrastructure may need to be retired early (or be retrofitted with carbon capture and storage technology) in order to meet the Paris Agreement climate goals17. Given the asset value per tonne of committed emissions, we suggest that the most cost-effective premature infrastructure retirements will be in the electricity and industry sectors, if non-emitting alternatives are available and affordable4,18.
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The numerical results plotted in Figs. 1–4 are provided with this paper. Our analysis relies on six different data sets, each used with permission and/or by license. Five are available from their original creators: (1) the GPED database: http://www.meicmodel.org/dataset-gped.html; (2) Platt’s WEPP database: https://www.spglobal.com/platts/en/products-services/electric-power/world-electric-power-plants-database; (3) the Carbon Monitoring for Action (CARMA) database: http://carma.org/; (4) the CoalSwarm database: https://endcoal.org/tracker/; and (5) vehicle sales data: https://www.statista.com/markets/419/topic/487/vehicles-road-traffic/. The sixth data set includes unit-level data for Chinese iron, steel and cement infrastructure, which we obtained directly from the Chinese Ministry of Ecology and Environment. We do not have permission to share the raw data, but we provide it in an aggregated form (Extended Data Fig. 2).
Matthews, H. D. & Caldeira, K. Stabilizing climate requires near-zero emissions. Geophys. Res. Lett. 35, L04705 (2008).
Meinshausen, M. et al. Greenhouse-gas emission targets for limiting global warming to 2 °C. Nature 458, 1158–1162 (2009).
Rogelj, J. et al. Zero emission targets as long-term global goals for climate protection. Environ. Res. Lett. 10, 105007 (2015).
Davis, S. J. et al. Net-zero emissions energy systems. Science 360, eaas9793 (2018).
Rogelj, J. et al. Mitigation pathways compatible with 1.5°C in the context of sustainable development. In: Global warming of 1.5 °C. An IPCC Special Report on the Impacts of Global warming of 1.5 °C above Pre-Industrial Levels and Related Global Greenhouse Gas Emission Pathways, in the Context of Strengthening the Global Response to the Threat of Climate Change, Sustainable Development, and Efforts to Eradicate Poverty (eds Masson-Delmotte, V. et al.) https://www.ipcc.ch/site/assets/uploads/sites/2/2019/05/SR15_Chapter2_Low_Res.pdf (2018).
Unruh, G. C. & Carrillo-Hermosilla, J. Globalizing carbon lock-in. Energy Policy 34, 1185–1197 (2006).
Matthews, H. D., Gillett, N. P., Stott, P. A. & Zickfeld, K. The proportionality of global warming to cumulative carbon emissions. Nature 459, 829–832 (2009).
Davis, S. J., Caldeira, K. & Matthews, H. D. Future CO2 emissions and climate change from existing energy infrastructure. Science 329, 1330–1333 (2010).
Davis, S. J. & Socolow, R. H. Commitment accounting of CO2 emissions. Environ. Res. Lett. 9, 084018 (2014).
Tong, D. et al. Targeted emission reductions from global super-polluting power plant units. Nat. Sustain. 1, 59–68 (2018).
Edenhofer, O., Steckel, J. C., Jakob, M. & Bertram, C. Reports of coal’s terminal decline may be exaggerated. Environ. Res. Lett. 13, 024019 (2018).
Pfeiffer, A., Hepburn, C., Vogt-Schilb, A. & Caldecott, B. Committed emissions from existing and planned power plants and asset stranding required to meet the Paris Agreement. Environ. Res. Lett. 13, 054019 (2018).
Smith, C. J. et al. Current fossil fuel infrastructure does not yet commit us to 1.5 °C warming. Nat. Commun. 10, 101 (2019).
Rogelj, J. et al. Differences between carbon budget estimates unravelled. Nat. Clim. Chang. 6, 245–252 (2016).
Peters, G. P. Beyond carbon budgets. Nat. Geosci. 11, 378–380 (2018).
Gasser, T., Guivarch, C., Tachiiri, K., Jones, C. D. & Ciais, P. Negative emissions physically needed to keep global warming below 2 °C. Nat. Commun. 6, 7958 (2015).
United Nations Framework Convention on Climate Change Adoption of the Paris Agreement. Report No. FCCC/CP/2015/L.9/Rev.1 http://unfccc.int/resource/docs/2015/cop21/eng/l09r01.pdf (UNFCCC, 2015).
Le Quéré, C. et al. Drivers of declining CO2 emissions in 18 developed economies. Nat. Clim. Chang. 9, 213–217 (2019).
Guan, D. et al. Structural decline in China’s CO2 emissions through transitions in industry and energy systems. Nat. Geosci. 11, 551–555 (2018).
Meng, J. et al. The rise of South–South trade and its effect on global CO2 emissions. Nat. Commun. 9, 1871 (2018).
Erickson, P., Kartha, S., Lazarus, M. & Tempest, K. Assessing carbon lock-in. Environ. Res. Lett. 10, 084023 (2015).
Seto, K. C. et al. Carbon lock-in: types, causes, and policy implications. Annu. Rev. Environ. Resour. 41, 425–452 (2016).
Bertram, C. et al. Carbon lock-in through capital stock inertia associated with weak near-term climate policies. Technol. Forecast. Soc. Change 90, 62–72 (2015).
Johnson, N. et al. Stranded on a low-carbon planet: implications of climate policy for the phase-out of coal-based power plants. Technol. Forecast. Soc. Change 90, 89–102 (2015).
Pfeiffer, A., Millar, R., Hepburn, C. & Beinhocker, E. The ‘2 °C capital stock’ for electricity generation: committed cumulative carbon emissions from the electricity generation sector and the transition to a green economy. Appl. Energy 179, 1395–1408 (2016).
Wilson, C., Grubler, A., Bauer, N., Krey, V. & Riahi, K. Future capacity growth of energy technologies: are scenarios consistent with historical evidence? Clim. Change 118, 381–395 (2013).
Burnham, A. et al. Life-cycle greenhouse gas emissions of shale gas, natural gas, coal, and petroleum. Environ. Sci. Technol. 46, 619–627 (2012).
Arneth, A. et al. Historical carbon dioxide emissions caused by land-use changes are possibly larger than assumed. Nat. Geosci. 10, 79–84 (2017).
Raupach, M. R. et al. Sharing a quota on cumulative carbon emissions. Nat. Clim. Chang. 4, 873–879 (2014).
Rubin, E. S. & Zhai, H. The cost of carbon capture and storage for natural gas combined cycle power plants. Environ. Sci. Technol. 46, 3076–3084 (2012).
Luderer, G. et al. Residual fossil CO2 emissions in 1.5–2 °C pathways. Nat. Clim. Chang. 8, 626–633 (2018).
Rogelj, J. et al. Energy system transformations for limiting end-of-century warming to below 1.5 °C. Nat. Clim. Chang. 5, 519–527 (2015); corrigendum 6, 538 (2016).
Grubler, A. et al. A low energy demand scenario for meeting the 1.5 °C target and sustainable development goals without negative emission technologies. Nat. Energy 3, 515–527 (2018).
Shearer, C. et al. Boom and Bust 2018: Tracking the Global Coal Plant Pipeline. March 2018 Report (CoalSwarm, Sierra Club and Greenpeace, 2018).
Ummel, K. CARMA Revisited: An Updated Database of Carbon Dioxide Emissions From Power Plants Worldwide. Working Paper 304 (Center for Global Development, 2012).
Tong, D. et al. Current emissions and future mitigation pathways of coal-fired power plants in China from 2010 to 2030. Environ. Sci. Technol. 52, 12905–12914 (2018).
World Electric Power Plant Database (WEPP). S&P Global Platts https://www.spglobal.com/platts/en/products-services/electric-power/world-electric-power-plants-database (2018).
Ward’s World Motor Vehicle Data. Wards Intelligence http://wardsauto.com/wards-world-motor-vehicle-data-0 (2008).
Statistics and Facts about Vehicles & Traffic, 2006-2017. Statista https://www.statista.com/ (2018).
IPCC Guidelines for National Greenhouse Gas Inventories Vol. 4 (Bracknell, 2006).
International Energy Agency. CO2 emissions from fuel combustion statistics, 2016. Organization for Economic Cooperation and Development (OECD) https://www.oecd-ilibrary.org/energy/co2-emissions-from-fuel-combustion-2016_co2_fuel-2016-en (2016).
National Minerals Information Center. Commodity Statistics and Information. United States Geological Survey https://www.usgs.gov/centers/nmic/commodity-statistics-and-information (2016).
Davis, S. C. & Diegel, S. W. Transportation Energy Data Book 25th edn (Center for Transportation Analysis, Oak Ridge National Laboratory, 2006).
Zheng, B. et al. High-resolution mapping of vehicle emissions in China in 2008. Atmos. Chem. Phys. 14, 9787–9805 (2014).
Forster, P. et al. Mitigation Pathways Compatible with 1.5 °C in the Context of Sustainable Development: Supplementary Material https://report.ipcc.ch/sr15/pdf/sr15_chapter2_supplementary_materials.pdf (2018).
Tanaka, K. & O’Neill, B. C. The Paris Agreement zero-emissions goal is not always consistent with the 1.5 °C and 2 °C temperature targets. Nat. Clim. Chang. 8, 319–324 (2018).
Millar, R. J. et al. Emission budgets and pathways consistent with limiting warming to 1.5 °C. Nat. Geosci. 10, 741–747 (2017); correction 11, 454–455 (2018).
Jones, C. D. et al. Simulating the Earth system response to negative emissions. Environ. Res. Lett. 11, 095012 (2016).
Schurer, A. P., Mann, M. E., Hawkins, E., Tett, S. F. B. & Hegerl, G. C. Importance of the pre-industrial baseline for likelihood of exceeding Paris goals. Nat. Clim. Chang. 7, 563–567 (2017).
Lowe, J. A. & Bernie, D. The impact of Earth system feedbacks on carbon budgets and climate response. Phil. Trans. Royal Soc. A 376, 20170263 (2018).
Comyn-Platt, E. et al. Carbon budgets for 1.5 and 2 °C targets lowered by natural wetland and permafrost feedbacks. Nat. Geosci. 11, 568–573 (2018); correction 11, 882–886 (2018).
Gasser, T. et al. Path-dependent reductions in CO2 emission budgets caused by permafrost carbon release. Nat. Geosci. 11, 830–835 (2018); correction 12, 80 (2019).
MacDougall, A. H., Zickfeld, K., Knutti, R. & Matthews, H. D. Sensitivity of carbon budgets to permafrost carbon feedbacks and non-CO2 forcings. Environ. Res. Lett. 10, 125003 (2015); correction 11, 019501 (2016).
Mengis, N., Partanen, A.-I., Jalbert, J. & Matthews, H. D. 1.5 °C carbon budget dependent on carbon cycle uncertainty and future non-CO2 forcing. Sci. Rep. 8, 5831 (2018).
Rogelj, J., Meinshausen, M., Schaeffer, M., Knutti, R. & Riahi, K. Impact of short-lived non-CO2 mitigation on carbon budgets for stabilizing global warming. Environ. Res. Lett. 10, 075001 (2015).
Alvarez, R. A. et al. Assessment of methane emissions from the U.S. oil and gas supply chain. Science 361, 186–188 (2018).
Carlson, K. M. et al. Greenhouse gas emissions intensity of global croplands. Nat. Clim. Chang. 7, 63–68 (2017).
Hirth, L. & Steckel, J. C. The role of capital costs in decarbonizing the electricity sector. Environ. Res. Lett. 11, 114010 (2016).
Meunier, G., Ponssard, J.-P. & Thomas, C. Capacity investment under demand uncertainty: the role of imports in the U.S. cement industry: capacity investment under demand uncertainty. J. Econ. Manage. Strategy 25, 455–486 (2016).
U.S. Energy Information Administration. Levelized Cost and Levelized Avoided Cost of New Generation Resources in the Annual Energy Outlook. Report No AEO2019 https://www.eia.gov/outlooks/aeo/pdf/electricity_generation.pdf (2019).
U.S. Energy Information Administration. Capital Cost Estimates for Utility Scale Electricity Generating Plants https://www.eia.gov/analysis/studies/powerplants/capitalcost/pdf/capcost_assumption.pdf (2016).
Schröder, A., Kunz, F., Meiss, J., Mendelevitch, R. & Von Hirschhausen, C. Data Documentation: Current and Prospective Costs of Electricity Generation until 2050. Report No. 68 (Deutsches Institut für Wirtschaftsforschung, 2013).
Energy Technology Systems Analysis Programme. Industrial Combustion Boilers. Technology Brief I01. https://www.etsap.org (International Energy Authority, 2010).
Energy Technology Systems Analysis Programme. Cooking Appliances. Technology Brief R06. https://www.etsap.org (International Energy Authority, 2012).
International Energy Agency. Energy Statistics and Balances of OECD Countries 2015. https://www.iea.org/classicstats/relateddatabases/worldenergystatisticsandbalances/(2016).
International Energy Agency. Energy Statistics and Balances of Non-OECD Countries 2015, (2016).
Storchmann, K. On the depreciation of automobiles: an international comparison. Transportation 31, 371–408 (2004).
Liu, F. et al. High-resolution inventory of technologies, activities, and emissions of coal-fired power plants in China from 1990 to 2010. Atmos. Chem. Phys. 15, 18787–18837 (2015).
Janssens-Maenhout, G. et al. HTAP_v2.2: a mosaic of regional and global emission grid maps for 2008 and 2010 to study hemispheric transport of air pollution. Atmos. Chem. Phys. 15, 11411–11432 (2015).
D.T. was supported by NASA’s Interdisciplinary Research in Earth Science (IDS) programme (80NSSC17K0416) and the National Natural Science Foundation of China (41625020). Q.Z. was supported by the National Natural Science Foundation of China (41625020). C.H., Y.Q. and S.J.D. were supported by the US National Science Foundation (Innovations at the Nexus of Food, Energy and Water Systems (INFEWS) grant EAR 1639318).
Nature thanks Gunnar Luderer, Katsumasa Tanaka and the other anonymous reviewer(s) for their contribution to the peer review of this work.
The authors declare no competing interests.
Publisher’s note: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended data figures and tables
a, b, Estimates of future CO2 emissions every four years (1998, 2002, 2006, 2010, 2014 and 2018) by industry sector (a) and country/region (b), assuming historical lifetimes and utilization rates. c, d, Corresponding changes in remaining commitments by industry sector (c) and country/region (d). Source Data
a, b, The operating capacity of raw steel in the iron and steel industry (a) and clinker in the cement industry (b). The youngest units are shown at the bottom. Source Data
This figure shows the numbers of vehicle sales by country/region. Source Data
Total committed emissions are plotted against asset value, by country/region and sector. Dashed horizontal lines indicate 50%, 75% and 90% of total committed emissions if operated as historically. Source Data
The figure shows historical CO2 emissions from fossil-fuel energy infrastructure (black), and future CO2 emissions from existing (red) and proposed (dark red) energy infrastructure, as well as future infrastructure (dark grey) under particular representative concentration pathways (RCPs: RCP8.5, RCP6, RCP4.5 and RCP2.6). Source Data
This figure shows survival curves for the electricity sector, cement industry, and iron and steel industry in China under the assumption of 40-year lifetimes. Source Data
The figure shows future annual CO2 emissions from residential, commercial and other energy infrastructure under the assumptions of 20-, 40- and 60-year lifetimes. Source Data
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Tong, D., Zhang, Q., Zheng, Y. et al. Committed emissions from existing energy infrastructure jeopardize 1.5 °C climate target. Nature 572, 373–377 (2019). https://doi.org/10.1038/s41586-019-1364-3
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