Carbon budget

Short description: Limit on carbon dioxide emission for a given climate impact

Carbon budget and emission reduction scenarios needed to reach the two-degree target agreed to in the Paris Agreement (without net negative emissions, based on peak emissions)[1]

A carbon budget is a concept used in climate policy to help set emissions reduction targets in a fair and effective way. It looks at "the maximum amount of cumulative net global anthropogenic carbon dioxide (CO
2) emissions that would result in limiting global warming to a given level".[2]: 2220 When expressed relative to the pre-industrial period it is referred to as the total carbon budget, and when expressed from a recent specified date it is referred to as the remaining carbon budget.[2]: 2220

A carbon budget consistent with keeping warming below a specified limit is also referred to as an emissions budget, an emissions quota, or allowable emissions.[3][4][5] An emissions budget may also be associated with objectives for other related climate variables, such as radiative forcing[6] or sea level rise.[7]

Total or remaining carbon budgets are calculated by combining estimates of various contributing factors, including scientific evidence and value judgments or choices.[8][9][10][11][12]

Global carbon budgets can be further divided into national emissions budgets, so that countries can set specific climate mitigation goals. Emissions budgets are relevant to climate change mitigation because they indicate a finite amount of carbon dioxide that can be emitted over time, before resulting in dangerous levels of global warming. Change in global temperature is independent from the geographic location of these emissions, and is largely independent of the timing of these emissions.[13][14]

Carbon budgets are applicable to the global level. To translate these global carbon budgets to the country level, a set of value judgments have to be made on how to distribute the total and remaining carbon budget. This involves the consideration of aspects of equity and fairness between countries[12][15] as well as other methodological choices.[15] There are many differences between nations, including but not limited to population, level of industrialisation, national emissions histories, and mitigation capabilities. For this reason, scientists have made attempts to allocate global carbon budgets among countries using methods that follow various principles of equity.[16]

## Contents

* 1 Definition
* 2 Estimations
* 2.1 Recent and currently remaining carbon budget
* 2.2 Carbon budget in gigatonnes and factors
* 3 National emissions budgets
* 4 Pathways to stay within carbon budget
* 5 See also
* 6 References
* 7 External links

## Definition

The IPCC Sixth Assessment Reports defines carbon budget as the following two concepts:[2]: 2220

* "An assessment of carbon cycle sources and sinks on a global level, through the synthesis of evidence for fossil fuel and cement emissions, emissions and removals associated with land use and land-use change, ocean and natural land sources and sinks of carbon dioxide (CO2), and the resulting change in atmospheric CO2 concentration. This is referred to as the global carbon budget."; or
* "The maximum amount of cumulative net global anthropogenic CO2 emissions that would result in limiting global warming to a given level with a given probability, taking into account the effect of other anthropogenic climate forcers. This is referred to as the total carbon budget when expressed starting from the pre-industrial period, and as the remaining carbon budget when expressed from a recent specified date."

Global carbon budgets can be further divided into national emissions budgets, so that countries can set specific climate mitigation goals.

An emissions budget may be distinguished from an emissions target, as an emissions target may be internationally or nationally set in accordance with objectives other than a specific global temperature and are commonly applied to the annual emissions in a single year as well.

## Estimations

### Recent and currently remaining carbon budget

Historical (unrestrained) carbon budget: Cumulative contributions to the global carbon budget since 1850 illustrate how source and sink components have been out of balance, causing an approximately 50% rise in atmospheric CO
2.[17]

Fossil CO
2 emissions: global; territorial; by fuel type (incl cement); per capita[18]

Several organisations provide annual updates to the remaining carbon budget, including the Global Carbon Project, the Mercator Research Institute on Global Commons and Climate Change (MCC)[19] and the CONSTRAIN project.[20] In March 2022, before formal publication of the 'Global Carbon Budget 2021' preprint,[18] scientists reported, based on Carbon Monitor[21] (CM) data, that after COVID-19-pandemic-caused record-level declines in 2020, global CO
2 emissions rebounded sharply by 4.8% in 2021, indicating that at the current trajectory, the carbon budget for a ⅔ likelihood for limiting warming to 1.5 °C would be used up within 9.5 years.[22]

In April 2022, the now reviewed and officially published The Global Carbon Budget 2021 concluded that fossil CO
2 emissions rebounded[23] from pandemic levels by around +4.8% relative to 2020 emissions – returning to 2019 levels.

It identifies three major issues for improving reliable accuracy of monitoring, shows that China and India surpassed 2019 levels (by 5.7% and 3.2%) while the EU and the US stayed beneath 2019 levels (by 5.3% and 4.5%), quantifies various changes and trends, for the first time provides models' estimates that are linked to the official country GHG inventories reporting, and suggests that the remaining carbon budget at 1. Jan 2022 for a 50% likelihood to limit global warming to 1.5 °C (albeit a temporary exceedence is to be expected) is 120 GtC (420 GtCO
2) – or 11 years of 2021 emissions levels.[18]

This does not mean that likely 11 years remain to cut emissions but that if emissions stayed the same, instead of increasing like in 2021, 11 years of constant GHG emissions would be left in the hypothetical scenario that all emissions suddenly ceased in the 12th year. (The 50% likelihood may be describable as a kind of minimum plausible deniability requirement as lower likelihoods would make the 1.5 °C goal "unlikely".) Moreover, other trackers show (or highlight) different amounts of carbon budget left, such as the MCC, which as of May 2022 shows '7 years 1 month left'[19] and different likelihoods have different carbon budgets: a 83% likelihood would mean 6.6 ±0.1 years left (ending in 2028) according to CM data.[22]

In October 2023 a group of researchers updated the carbon budget including the CO2 emitted at 2020-2022 and new findings about the role of reduced presence of polluting particles in the atmosphere.[24] They found we can emit 250 GtCO2 or 6 years of emissions at current level starting from January 2023, for having a 50% chance to stay below 1.5 degrees. For reaching this target humanity will need to zero CO2 emissions by the year 2034. To have a 50% chance of staying below 2 degrees humanity can emit 1220 GtCO
2 or 30 years of emissions at current level.[25][26]

### Carbon budget in gigatonnes and factors

Estimating the remaining carbon budget at the global level depends on climate science and value judgments or choices. To translate a global budget to the national level, further value judgments and choices have to be made. Figure from the CONSTRAIN Zero In On Report.[8]

The finding of an almost linear relationship between global temperature rise and cumulative carbon dioxide emissions[14] has encouraged the estimation of global emissions budgets in order to remain below dangerous levels of warming. Since the pre-industrial period to 2019, approximately 2390 Gigatonnes of CO
2 (Gt CO
2) has already been emitted globally.[11]

Scientific estimations of the remaining global emissions budgets/quotas differ due to varied methodological approaches, and considerations of thresholds.[27] Estimations might not include all amplifying climate change feedbacks,[28][29][30][31] although the most authoritative carbon budget assessments by the IPCC do account explicitly for these.[9][11] The IPCC assesses the size of remaining carbon budgets using estimates of past warming caused by human activities, the amount of warming per cumulative unit of CO2 emissions (also known as the Transient Climate Response to cumulative Emissions of carbon dioxide, or TCRE), the amount of warming that could still occur once all emissions of CO2 are halted (known as the Zero Emissions Commitment[32]), and the impact of Earth system feedbacks that would otherwise not be covered; and vary according to the global temperature target that is chosen, the probability of staying below that target, and the emission of other non-CO
2 greenhouse gases (GHGs).[9][10][11][33] This approach was first applied in the 2018 Special report on Global Warming of 1.5°C by the IPCC,[9] and was also used in its 2021 Working Group I Contribution to the Sixth Assessment Report.[11]

Carbon budget estimates depend on the likelihood or probability of avoiding a temperature limit, and the assumed warming that is projected to be caused by non-CO
2 emissions.[9][10][11][34] The values for the carbon budget estimates in the following table are drawn from the latest assessment of the Physical Science Basis of climate change by the Working Group I Contribution to the IPCC Sixth Assessment Report.[11] These estimates assume non-CO
2 emissions are also reduced in line with deep decarbonisation scenarios that reach global net zero CO
2 emissions.[9][10][11] Carbon budget estimates thus depend on how successful society is in reducing non-CO
2 emissions together with carbon dioxide emissions. The IPCC Sixth Assessment Report estimated that remaining carbon budgets can be 220 Gt CO
2 higher or lower depending on how successful non-CO
2 emissions are reduced.[11]

Estimated carbon budgets in GtCO
2 from 2020 with likelihoods[11]: Table 5.8 Global warming relative to 1850-1900  | 17%  | 33%  | 50%  | 66%  | 83%

|
|
|
|
|

1.5 °C  | 900 | 650 | 500 | 400 | 300
1.7 °C  | 1450 | 1050 | 850 | 700 | 550
2.0 °C  | 2300 | 1700 | 1350 | 1150 | 900

## National emissions budgets

Carbon budgets are applicable to the global level. To translate these global carbon budgets to the country level, a set of value judgments have to be made on how to distribute the total and remaining carbon budget. In light of the many differences between nations, including but not limited to population, level of industrialisation, national emissions histories, and mitigation capabilities, scientists have made attempts to allocate global carbon budgets among countries using methods that follow various principles of equity.[16] Allocating national emissions budgets is comparable to sharing the effort to reduce global emissions, underlined by some assumptions of state-level responsibility of climate change. Many authors have conducted quantitative analyses which allocate emissions budgets,[5][35][36][37][38] often simultaneously addressing disparities in historical GHG emissions between nations.

One guiding principle that is used to allocate global emissions budgets to nations is the principle of "common but differentiated responsibilities and respective capabilities" that is included in the United Nations Framework Convention on Climate Change (UNFCCC).[16] This principle is not defined in further detail in the UNFCCC but is broadly understood to recognize nations' different cumulative historical contributions to global emissions as well as their different development stages. From this perspective, those countries with greater emissions during a set time period (for example, since the pre-industrial era to the present) are the most responsible for addressing excess emissions, as are countries that are richer. Thus, their national emissions budgets have to be smaller than those from countries that have polluted less in the past, or are poorer. The concept of national historical responsibility for climate change has prevailed in the literature since the early 1990s[39][40] and has been part of the key international agreements on climate change (UNFCCC, the Kyoto Protocol and the Paris Agreement). Consequently, those countries with the highest cumulative historical emissions have the most responsibility to take the strongest actions[41] and help developing countries to mitigate their emissions and adapt to climate change. This principle is recognized in international treaties and has been part of the diplomatic strategies by developing countries, that argue that they need larger emissions budgets[42] to reduce inequity and achieve sustainable development.

Another common equity principle for calculating national emissions budgets is the "egalitarian" principle. This principle stipulates individuals should have equal rights, and therefore emissions budgets should be distributed proportionally according to state populations.[16] Some scientists have thus reasoned the use of national per-capita emissions in national emissions budget calculations.[35][36][37][43] This principle may be favoured by nations with larger or rapidly growing populations,[42] but raises the question whether individuals can have a right to pollute.[44]

A third equity principle that has been employed in national budget calculations considers national sovereignty.[16] The "sovereignty" principle highlights the equal right of nations to pollute.[16] The grandfathering method for calculating national emissions budgets uses this principle. Grandfathering allocates these budgets proportionally according to emissions at a particular base year,[43] and has been used under international regimes such as the Kyoto Protocol[45] and the early phase of the European Union Emissions Trading Scheme (EU ETS)[46] This principle is often favoured by developed countries, as it allocates larger emissions budgets to them.[42] However, recent publications highlight that grandfathering is unsupported as an equity principle as it "creates 'cascading biases' against poorer states,[47] is not a 'standard of equity'[48]".[49] Other scholars have highlighted that "to treat states as the owners of emission rights has morally problematic consequences".[44]

## Pathways to stay within carbon budget

The steps that can be taken to stay within one's carbon budget are explained within the concept of climate change mitigation.

This section is an excerpt from climate change mitigation[ edit ]

## See also

* Global Carbon Project

## References

1. ↑ Christiana Figueres; Hans Joachim Schellnhuber; Gail Whiteman; Johan Rockström (2017-06-29). "Three years to safeguard our climate" (in en). Nature 546 (7660): pp. 593–595. doi:10.1038/546593a. ISSN 0028-0836. http://www.nature.com/articles/546593a.
2. ↑ 2.0 2.1 2.2 IPCC, 2021: Annex VII: Glossary [Matthews, J.B.R., V. Möller, R. van Diemen, J.S. Fuglestvedt, V. Masson-Delmotte, C. Méndez, S. Semenov, A. Reisinger (eds.)]. In Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [Masson-Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M.I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J.B.R. Matthews, T.K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, pp. 2215–2256, doi:10.1017/9781009157896.022.
3. ↑ Meinshausen, Malte; Meinshausen, Nicolai; Hare, William; Raper, Sarah C. B.; Frieler, Katja; Knutti, Reto; Frame, David J.; Allen, Myles R. (April 2009). "Greenhouse-gas emission targets for limiting global warming to 2 °C". Nature 458 (7242): 1158–1162. doi:10.1038/nature08017. PMID 19407799. Bibcode: 2009Natur.458.1158M.
4. ↑ Matthews, H Damon; Zickfeld, Kirsten; Knutti, Reto; Allen, Myles R (1 January 2018). "Focus on cumulative emissions, global carbon budgets and the implications for climate mitigation targets". Environmental Research Letters 13 (1): 010201. doi:10.1088/1748-9326/aa98c9. Bibcode: 2018ERL....13a0201D.
5. ↑ 5.0 5.1 Raupach, Michael R.; Davis, Steven J.; Peters, Glen P.; Andrew, Robbie M.; Canadell, Josep G.; Ciais, Philippe; Friedlingstein, Pierre; Jotzo, Frank et al. (21 September 2014). "Sharing a quota on cumulative carbon emissions". Nature Climate Change 4 (10): 873–879. doi:10.1038/nclimate2384. Bibcode: 2014NatCC...4..873R. http://www.escholarship.org/uc/item/1kv3p879.
6. ↑ Intergovernmental Panel On Climate Change (2014). Climate Change 2013: The Physical Science Basis: Working Group I Contribution to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press. ISBN 978-1-107-05799-9. https://www.ipcc.ch/report/ar5/wg1/. [page needed]
7. ↑ Clark, Peter U.; Mix, Alan C.; Eby, Michael; Levermann, Anders; Rogelj, Joeri; Nauels, Alexander; Wrathall, David J. (2018). "Sea-level commitment as a gauge for climate policy" (in en). Nature Climate Change 8 (8): 653–655. doi:10.1038/s41558-018-0226-6. ISSN 1758-678X. Bibcode: 2018NatCC...8..653C. http://www.nature.com/articles/s41558-018-0226-6.
8. ↑ 8.0 8.1 Nauels, Alex; Rosen, Debbie; Mauritsen, Thorsten; Maycock, Amanda; McKenna, Christine; Roegli, Joeri; Schleussner, Carl-Friedrich; Smith, Ela et al. (2019). "ZERO IN ON the remaining carbon budget and decadal warming rates. The CONSTRAIN Project Annual Report 2019". University of Leeds. doi:10.5518/100/20. http://eprints.whiterose.ac.uk/154082/.
9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 "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". Mitigation pathways compatible with 1.5°C in the context of sustainable development. IPCC/WMO. 2018. pp. 93–174. http://www.ipcc.ch/report/sr15/.
10. ↑ 10.0 10.1 10.2 10.3 Rogelj, Joeri; Forster, Piers M.; Kriegler, Elmar; Smith, Christopher J.; Séférian, Roland (2019-07-18). "Estimating and tracking the remaining carbon budget for stringent climate targets" (in en). Nature 571 (7765): 335–342. doi:10.1038/s41586-019-1368-z. ISSN 0028-0836. PMID 31316194. Bibcode: 2019Natur.571..335R. http://www.nature.com/articles/s41586-019-1368-z.
11. ↑ 11.00 11.01 11.02 11.03 11.04 11.05 11.06 11.07 11.08 11.09 "Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change". Global Carbon and other Biogeochemical Cycles and Feedbacks. Cambridge University Press. 2021. https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_Chapter_05.pdf.
12. ↑ 12.0 12.1 Matthews, H. Damon; Tokarska, Katarzyna B.; Nicholls, Zebedee R. J.; Rogelj, Joeri; Canadell, Josep G.; Friedlingstein, Pierre; Frölicher, Thomas L.; Forster, Piers M. et al. (2020). "Opportunities and challenges in using remaining carbon budgets to guide climate policy" (in en). Nature Geoscience 13 (12): 769–779. doi:10.1038/s41561-020-00663-3. ISSN 1752-0894. Bibcode: 2020NatGe..13..769M. http://www.nature.com/articles/s41561-020-00663-3.
13. ↑ Zickfeld, K.; Arora, V. K.; Gillett, N. P. (March 2012). "Is the climate response to CO emissions path dependent?". Geophysical Research Letters 39 (5): n/a. doi:10.1029/2011gl050205. Bibcode: 2012GeoRL..39.5703Z.
14. ↑ 14.0 14.1 Matthews, H. Damon; Gillett, Nathan P.; Stott, Peter A.; Zickfeld, Kirsten (June 2009). "The proportionality of global warming to cumulative carbon emissions". Nature 459 (7248): 829–832. doi:10.1038/nature08047. PMID 19516338. Bibcode: 2009Natur.459..829M.
15. ↑ 15.0 15.1 Nauels, Alex; Rosen, Debbie; Mauritsen, Thorsten; Maycock, Amanda; McKenna, Christine; Roegli, Joeri; Schleussner, Carl-Friedrich; Smith, Ela et al. (2019). ZERO IN ON the remaining carbon budget and decadal warming rates. The CONSTRAIN Project Annual Report 2019. University of Leeds. doi:10.5518/100/20. http://eprints.whiterose.ac.uk/154082/.
16. ↑ 16.0 16.1 16.2 16.3 16.4 16.5 Ringius, L.; Torvanger, A.; Underdal, A. (2002). "Burden sharing and fairness principles in international climate policy". International Environmental Agreements 2 (1): 1–22. doi:10.1023/a:1015041613785. https://folk.uio.no/stvau1/Journal articles/Burdensharing.pdf.
17. ↑ "Global Carbon Budget 2021". 4 November 2021. p. 57. https://www.globalcarbonproject.org/carbonbudget/21/files/GCP_CarbonBudget_2021.pdf. "The cumulative contributions to the global carbon budget from 1850. The carbon imbalance represents the gap in our current understanding of sources & sinks. ... Source: Friedlingstein et al 2021; Global Carbon Project 2021"
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* News report: "Cut emissions "starting now" – Global Carbon Project experts" (in en). University of Exeter. https://www.exeter.ac.uk/news/research/title_909259_en.html.
19. ↑ 19.0 19.1 "Remaining carbon budget - Mercator Research Institute on Global Commons and Climate Change (MCC)". https://www.mcc-berlin.net/en/research/co2-budget.html.
20. ↑ "Publications | Reports Archives" (in en). https://constrain-eu.org/publications/type/reports/.
21. ↑ "Carbon monitor". https://carbonmonitor.org/.
22. ↑ 22.0 22.1 Liu, Zhu; Deng, Zhu; Davis, Steven J.; Giron, Clement; Ciais, Philippe (April 2022). "Monitoring global carbon emissions in 2021" (in en). Nature Reviews Earth & Environment 3 (4): 217–219. doi:10.1038/s43017-022-00285-w. ISSN 2662-138X. PMID 35340723. Bibcode: 2022NRvEE...3..217L.
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25. ↑ McGrath, Matt (31 October 2023). "Carbon emissions threaten 1.5C climate threshold sooner than thought - report". BBC. Nature Climate Change. https://www.bbc.com/news/science-environment-67242386.
26. ↑ BORENSTEIN, SETH (30 October 2023). "Earth Will Lock in 1.5°C of Warming By 2029 At Current Rate of Burning Fossil Fuels". Times. https://time.com/6329852/earth-will-hit-carbon-budget-warming-threshold-in-2029-study/.
27. ↑ Rogelj, Joeri; Schaeffer, Michiel; Friedlingstein, Pierre; Gillett, Nathan P.; van Vuuren, Detlef P.; Riahi, Keywan; Allen, Myles; Knutti, Reto (24 February 2016). "Differences between carbon budget estimates unravelled". Nature Climate Change 6 (3): 245–252. doi:10.1038/nclimate2868. Bibcode: 2016NatCC...6..245R.
28. ↑ Rogelj, Joeri; Forster, Piers M.; Kriegler, Elmar; Smith, Christopher J.; Séférian, Roland (17 July 2019). "Estimating and tracking the remaining carbon budget for stringent climate targets". Nature 571 (7765): 335–342. doi:10.1038/s41586-019-1368-z. PMID 31316194. Bibcode: 2019Natur.571..335R.
29. ↑ Jamieson, Naomi Oreskes, Michael Oppenheimer, Dale. "Scientists Have Been Underestimating the Pace of Climate Change" (in en). https://blogs.scientificamerican.com/observations/scientists-have-been-underestimating-the-pace-of-climate-change/.
30. ↑ Comyn-Platt, Edward (2018). "Carbon budgets for 1.5 and 2 °C targets lowered by natural wetland and permafrost feedbacks". Nature Geoscience 11 (8): 568–573. doi:10.1038/s41561-018-0174-9. Bibcode: 2018NatGe..11..568C. http://centaur.reading.ac.uk/77371/3/NaturalCH4_Permafrost_EmissionBudgets_FinalEdit.pdf.
31. ↑ Lenton, Timothy M.; Rockström, Johan; Gaffney, Owen; Rahmstorf, Stefan; Richardson, Katherine; Steffen, Will; Schellnhuber, Hans Joachim (2019-11-27). "Climate tipping points — too risky to bet against" (in en). Nature 575 (7784): 592–595. doi:10.1038/d41586-019-03595-0. PMID 31776487. Bibcode: 2019Natur.575..592L.
32. ↑ MacDougall, Andrew H.; Frölicher, Thomas L.; Jones, Chris D.; Rogelj, Joeri; Matthews, H. Damon; Zickfeld, Kirsten; Arora, Vivek K.; Barrett, Noah J. et al. (2020-06-15). "Is there warming in the pipeline? A multi-model analysis of the Zero Emissions Commitment from CO
2" (in en). Biogeosciences 17 (11): 2987–3016. doi:10.5194/bg-17-2987-2020. ISSN 1726-4189. Bibcode: 2020BGeo...17.2987M. https://bg.copernicus.org/articles/17/2987/2020/.CO2&rft.jtitle=Biogeosciences&rft.aulast=MacDougall&rft.aufirst=Andrew+H.&rft.au=MacDougall, Andrew+H.&rft.au=Frölicher, Thomas+L.&rft.au=Jones, Chris+D.&rft.au=Rogelj, Joeri&rft.au=Matthews, H.+Damon&rft.au=Zickfeld, Kirsten&rft.au=Arora, Vivek+K.&rft.au=Barrett, Noah+J.&rft.au=Brovkin, Victor&rft.date=2020-06-15&rft.volume=17&rft.issue=11&rft.pages=2987–3016&rft_id=info:doi/10.5194/bg-17-2987-2020&rft_id=info:bibcode/2020BGeo...17.2987M&rft.issn=1726-4189&rft_id=https://bg.copernicus.org/articles/17/2987/2020/&rfr_id=info:sid/en.wikibooks.org:Earth:Carbon_budget">
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40. ↑ Smith, K. R. (1992). "Allocating responsibility for global warming: The natural debt index". Ambio. Stockholm 20 (2): 95–96.
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42. ↑ 42.0 42.1 42.2 Pan, J (2003). "Emissions rights and their transferability: equity concerns over climate change mitigation". International Environmental Agreements 3 (1): 1–16. doi:10.1023/A:1021366620577.
43. ↑ 43.0 43.1 Neumayer, Eric (2000). "In defence of historical accountability for greenhouse gas emissions". Ecological Economics 33 (2): 185–192. doi:10.1016/s0921-8009(00)00135-x. http://eprints.lse.ac.uk/18906/1/__Libfile_repository_Content_Neumayer, E_In defense of historical accountability for greenhouse gas emissions_In defense of historical accountability for greenhouse gas emissions (LSE RO).pdf.
44. ↑ 44.0 44.1 Caney, Simon (2009). "Justice and the distribution of greenhouse gas emissions1" (in en). Journal of Global Ethics 5 (2): 125–146. doi:10.1080/17449620903110300. ISSN 1744-9626. http://www.tandfonline.com/doi/abs/10.1080/17449620903110300.
45. ↑ UNFCCC (1998). "Kyoto Protocol to the United Nations Framework Convention on Climate Change".(http://unfccc.int/resource/docs/convkp/kpeng.pdf )
46. ↑ 2010/384/: Commission Decision of 9 July 2010 on the Community-wide quantity of allowances to be issued under the EU Emission Trading Scheme for 2013 (notified under document C(2010) 4658)
47. ↑ Kartha, Sivan; Athanasiou, Tom; Caney, Simon; Cripps, Elizabeth; Dooley, Kate; Dubash, Navroz K.; Fei, Teng; Harris, Paul G. et al. (2018). "Cascading biases against poorer countries" (in en). Nature Climate Change 8 (5): 348–349. doi:10.1038/s41558-018-0152-7. ISSN 1758-678X. Bibcode: 2018NatCC...8..348K. http://www.nature.com/articles/s41558-018-0152-7.
48. ↑ Dooley, Kate; Holz, Christian; Kartha, Sivan; Klinsky, Sonja; Roberts, J. Timmons; Shue, Henry; Winkler, Harald; Athanasiou, Tom et al. (2021). "Ethical choices behind quantifications of fair contributions under the Paris Agreement" (in en). Nature Climate Change 11 (4): 300–305. doi:10.1038/s41558-021-01015-8. ISSN 1758-678X. Bibcode: 2021NatCC..11..300D. http://www.nature.com/articles/s41558-021-01015-8.
49. ↑ Rajamani, Lavanya; Jeffery, Louise; Höhne, Niklas; Hans, Frederic; Glass, Alyssa; Ganti, Gaurav; Geiges, Andreas (2021-09-14). "National 'fair shares' in reducing greenhouse gas emissions within the principled framework of international environmental law" (in en). Climate Policy 21 (8): 983–1004. doi:10.1080/14693062.2021.1970504. ISSN 1469-3062. https://www.tandfonline.com/doi/full/10.1080/14693062.2021.1970504.

## External links

* The CONSTRAIN Project Annual Report Nauels, Alex; Rosen, Debbie; Mauritsen, Thorsten; Maycock, Amanda; McKenna, Christine; Roegli, Joeri; Schleussner, Carl-Friedrich; Smith, Ela et al. (2019). ZERO IN ON the remaining carbon budget and decadal warming rates. The CONSTRAIN Project Annual Report 2019. University of Leeds. doi:10.5518/100/20. http://eprints.whiterose.ac.uk/154082/.

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