Emission budgets and pathways consistent with limiting warming to 1.5 °C

Adoption of the Paris Agreement FCCC/CP/2015/L.9/Rev. 1 (UNFCCC, 2015); http://unfccc.int/resource/docs/2015/cop21/eng/l09r01.pdf

Otto, F. E. L., Frame, D. J., Otto, A. & Allen, M. R. Embracing uncertainty in climate change policy. Nat. Clim. Change 5, 917–920 (2015).

Morice, C. P., Kennedy, J. J., Rayner, N. A. & Jones, P. D. Quantifying uncertainties in global and regional temperature change using an ensemble of observational estimates: the HadCRUT4 data set. J. Geophys. Res. 117, D08101 (2012).

Rogelj, J. et al. Energy system transformations for limiting end-of-century warming to below 1.5 °C. Nat. Clim. Change 5, 519–527 (2015).

Sanderson, B. M., O’Neill, B. C. & Tebaldi, C. What would it take to achieve the Paris temperature targets? Geophys. Res. Lett. 43, 7133–7142 (2016).

Fawcett, A. A. et al. Can Paris pledges avert severe climate change? Science 350, 1168–1169 (2015).

Matthews, H. D. & Caldeira, K. Stabilizing climate requires near-zero emissions. Geophys. Res. Lett. 35, L04705 (2008).

Allen, M. R. et al. Warming caused by cumulative carbon emissions towards the trillionth tonne. Nature 458, 1163–1166 (2009).

Meinshausen, M. et al. Greenhouse-gas emission targets for limiting global warming to 2 °C. Nature 458, 1158–1162 (2009).

Zickfeld, K., Eby, M., Matthews, H. D. & Weaver, A. J. Setting cumulative emissions targets to reduce the risk of dangerous climate change. Proc. Natl Acad. Sci. USA 106, 16129–16134 (2009).

IPCC Climate Change 2014: Synthesis Report (eds Pachauri, R. K. & Meyer, L. A.) (Cambridge Univ. Press, 2014).

Le Quéré, C. et al. Global carbon budget 2015. Earth Syst. Sci. Data 7, 349–396 (2015).

Rogelj, J. et al. Paris Agreement climate proposals need boost to keep warming well below 2 °C. Nature 534, 631–639 (2016).

Collins, M. et al. in Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) 1029–1136 (IPCC, Cambridge Univ. Press, 2013).

Rogelj, J. et al. Differences between carbon budget estimates unravelled. Nat. Clim. Change 6, 245–252 (2016).

IPCC Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) (Cambridge Univ. Press, 2013).

Richardson, M., Cowtan, K., Hawkins, E. & Stolpe, M. B. Reconciled climate response estimates from climate models and the energy budget of Earth. Nat. Clim. Change 6, 931–935 (2016).

Hawkins, E. et al. Estimating changes in global temperature since the pre-industrial period. Bull. Am. Meteorol. Soc. http://dx.doi.org/10.1175/BAMS-D-16-0007.1 (2017).

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).

Myhre, G. et al. Multi-model simulations of aerosol and ozone radiative forcing due to anthropogenic emission changes during the period 1990–2015. Atmos. Chem. Phys. 17, 2709–2720 (2017).

van Vuuren, D. et al. RCP 2.6: exploring the possibility to keep global mean temperature increase below 2 °C. Climatic Change 109, 95–116 (2011).

Riahi, K. et al. RCP 8.5-A scenario of comparatively high greenhouse gas emissions. Climatic Change 109, 33–57 (2011).

IPCC Climate Change 2014: Mitigation of Climate Change (eds Edenhofer, O. et al.) (Cambridge Univ. Press, 2014).

Clarke, L. E. et al. in Climate Change 2014: Mitigation of Climate Change (eds Edenhofer, O. et al.) 413–510 (IPCC, Cambridge Univ. Press, 2014).

Shindell, D. T. Inhomogeneous forcing and transient climate sensitivity. Nat. Clim. Change 4, 18–21 (2014).

Kummer, J. R. R. & Dessler, A. E. E. The impact of forcing efficacy on the equilibrium climate sensitivity. Geophys. Res. Lett. 41, 3565–3568 (2014).

Andrews, T., Gregory, J. M., Webb, M. J. & Taylor, K. E. Forcing, feedbacks and climate sensitivity in CMIP5 coupled atmosphere–ocean climate models. Geophys. Res. Lett. 39, L09712 (2012).

Myhre, G. et al. in Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) 659–740 (IPCC, Cambirdge Univ. Press, 2013).

Millar, R. J., Nicholls, Z. R., Friedlingstein, P. & Allen, M. R. A modified impulse-response representation of the global near-surface air temperature and atmospheric concentration response to carbon dioxide emissions. Atmos. Chem. Phys. 17, 7213–7228 (2017).

Weaver, A. J. et al. The UVic Earth System Climate Model: model description, climatology, and applications to past, present and future climates. Atmos.-Ocean 39, 361–428 (2001).

Eby, M. et al. Historical and idealized climate model experiments: an intercomparison of Earth system models of intermediate complexity. Clim. Past 9, 1111–1140 (2013).

Zickfeld, K. et al. Long-term climate change commitment and reversibility: an EMIC intercomparison. J. Clim. 26, 5782–5809 (2013).

Millar, R., Allen, M., Rogelj, J. & Friedlingstein, P. The cumulative carbon budget and its implications. Oxford Rev. Econ. Policy 32, 323–342 (2016).

Jarvis, A. J., Leedal, D. T. & Hewitt, C. N. Climate-society feedbacks and the avoidance of dangerous climate change. Nat. Clim. Change 2, 668–671 (2012).

Stevens, B. Rethinking the lower bound on aerosol radiative forcing. J. Clim. 28, 4794–4819 (2015).

Etminan, M., Myhre, G., Highwood, E. J. & Shine, K. P. Radiative forcing of carbon dioxide, methane, and nitrous oxide: a significant revision of the methane radiative forcing. Geophys. Res. Lett. 43, 12614–12623 (2016).

Emission Gap Report 2015 (UNEP, 2015).

Rogelj, J. et al. Understanding the origin of Paris Agreement emission uncertainties. Nat. Commun. 8, 15748 (2017).

Fuglestvedt, J. S., Berntsen, T. K., Godal, O. & Skodvin, T. Climate implications of GWP-based reductions in greenhouse gas emissions. Geophys. Res. Lett. 27, 409–412 (2000).

Pierrehumbert, R. T. Short-lived climate pollution. Annu. Rev. Earth Planet. Sci. 42, 341–379 (2014).

Allen, M. R. et al. New use of global warming potentials to compare cumulative and short-lived climate pollutants. Nat. Clim. Change 6, 773–776 (2016).

Bowerman, N. H. A. et al. The role of short-lived climate pollutants in meeting temperature goals. Nat. Clim. Change 3, 8–11 (2013).

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).

Riahi, K. et al. Locked into Copenhagen pledges—implications of short-term emission targets for the cost and feasibility of long-term climate goals. Technol. Forecast. Soc. Change 90, 8–23 (2015).

Smith, P. et al. Biophysical and economic limits to negative CO2 emissions. Nat. Clim. Change 6, 4–50 (2015).

Jackson, R. B. et al. Reaching peak emissions. Nat. Clim. Change 6, 7–10 (2015).

Grubb, M. et al. A review of Chinese CO2 emission projections to 2030: the role of economic structure and policy. Clim. Policy 15, S7–S39 (2015).

Green, F. & Stern, N. China’s changing economy: implications for its carbon dioxide emissions. Clim. Policy 17, 423–442 (2017).

Kirtman, B. et al. in Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) 95–1028 (IPCC, Cambridge Univ. Press, 2013).

Pueyo, S. Solution to the paradox of climate sensitivity. Climatic Change 113, 163–179 (2012).

Armour, K. C. Energy budget constraints on climate sensitivity in light of inconstant climate feedbacks. Nat. Clim. Change 7, 331–335 (2017).

Millar, R. J. et al. Model structure in observational constraints on transient climate response. Climatic Change 131, 199–211 (2015).

Meinshausen, M., Raper, S. C. B. & Wigley, T. M. L. Emulating coupled atmosphere-ocean and carbon cycle models with a simpler model, MAGICC6–Part 1: Model description and calibration. Atmos. Chem. Phys. 11, 1417–1456 (2011).

Stocker, T. F. et al. in Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) 33–115 (IPCC, Cambirdge Univ. Press, 2013).