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description=The Climate Equity Reference Project (CERP) is a long-term initiative designed to provide scholarship, tools, and analysis to advance global climate;

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and is used across this site in the lead up to the 2015 paris climate summit which resulted in the paris agreement we provided the analysis and technical support for the equity review of the climate mitigation pledges put forth by countries before the paris summit which was undertaken by a unprecedented coalition of global civil society organizations about read more about the climate equity reference project and it s climate equity reference framework immediately below learn more about the calculator learn more about how to use the interactive climate equity reference calculator and about the methodology data sources etc behind it learn more the calculator launch the interactive climate equity reference calculator to explore the framework yourself launch cerc about the climate equity reference project the climate equity reference project cerp is a long term initiative designed to provide scholarship tools and analysis to advance global climate equity as a value in itself and as a realist path towards an ambitious global climate regime the cerp is strongly rooted in current climate science in particular the ipcc s estimates of the remaining global carbon budget it is also consistent with the un framework convention s core equity principles which can be concisely stated as a precautionary approach to adequacy common but differentiated responsibilities and respective capabilities and equitable access to sustainable development this site offers explanations of the cerp effort sharing framework as well as an online climate equity reference calculator that allows users to interactively explore user defined implementations of that framework importantly it also offers a set of indc assessments that is based upon the outputs of that calculator while these assessments are made relative to an indicative equity band that is bounded by two pre defined equity settings high equity and low equity the online calculator allows and indeed encourages users to choose their own preferred equity settings a few key points the cerp approach is designed to be general to encompass a wide set of equity approaches to express these approaches by way of straightforward and objective indicators and to clearly present their implications with respect to national fair shares of a common global effort at the same time it is precise enough to quantitatively evaluate and compare national contributions to the common effort as they are being tabled in the international climate negotiations in all this there are a small number of key points to keep in mind the cerp approach is a dynamic one for each nation in each year indicators of and together with a variety of macro economic data that together define national development need estimated by way of a are used to calculate a or rci the exact definitions of responsibility capacity and development need and the relative weighting given to responsibility and capacity are chosen by the user the national rci is then used to determine the national of the which is also based on a global no policy baseline and on the user s choice of a the following figure illustrates the method here by showing a global mitigation requirement that is partitioned into national fair shares which are assigned to individual countries on the basis of their dynamically shifting responsibility and capacity globally required mitigation blue area divided among countries in proportion to their share of global responsibility and capacity the example here and it is only an example features the strong 2 c global mitigation pathway and the medium equity settings see the national fair shares report for an overview set of illustrative cases the responsibility and capacity index can also quite properly be used to estimate national fair shares in a global adaptation effort not that it can help us to estimate the global or the adaptation need of any given country but it does offer a way to think about national fair shares of any monetized global climate related effort global adaptation need is properly estimated as a function of projected temperature change and national vulnerability at the moment in the calculator all we offer is a user defined parameter that is specified as a percentage of projected gross world product critically national fair shares of the global mitigation requirement are not seen in domestic terms the cerp views climate as a global commons problem that can only be solved within a high cooperation international regime such a regime can only be established if each party sees others to be doing their fair shares in the face of the common challenge in practice of course each country will decide on the basis of its own specific considerations e g it s own view of costs co benefits and political economic tradeoffs what fraction of its fair share of the global mitigation effort it will attempt domestically and what fraction it will make off shore by supporting mitigation action in other countries key links the climate equity reference calculator the climate equity reference calculator is a interactive online equity reference tool that systematically applies cerp s effort sharing approach with the goal of allowing users to quantitatively examine the problem of national fair shares in a global effort to rapidly reduce greenhouse gas emissions this approach can be applied using a range of mitigation pathways equity settings and other assumptions whichever are chosen they are applied to all countries in a dynamic fashion that reflects the changing global economy national fair shares the mitigation gap domestic actions international support the national fair shares report is a systematic attempt to apply cerp s effort sharing approach to a set set of twelve representative countries and a selected set of illustrative cases these cases are bounded by a high equity case and a low equity case which together define an illustrative equity band assessment of national indcs the climate equity reference framework is designed to support the meaningful analysis of national climate action pledges relative to the global challenge and relative to other national pledges our initial assessment of the national indcs illustrates some of the possibilities of applying equity reference frameworks to national pledges in this assessment importantly the equity and ambition of individual indcs are examined within the cerp s resource sharing approach as well as within its effort sharing approach historical note this project is an evolution beyond our earlier greenhouse development rights project it provides a more general approach to a dynamic equity reference framework and is focused on highlighting those results and conclusions that are common across a wide range of perspectives in the calculations here responsibility contribution to the climate problem is defined as the sum of all emissions corresponding to consumption above the user specified development threshold as is the case with capability emissions corresponding to consumption below that threshold are not included in the calculation of responsibility as they are exempted on the grounds of say being associated with basic or survival consumption responsibility is measured cumulatively since some user specified start date to the extent that emissions before the start date contributed to current capability they are accounted for implicitly in the capability measure in calculating national fair shares responsibility and capability a simple average in the default case though the weighting can be changed are combined to compute a responsibility and capability index this calculator defines capability in income terms it allows the user use a progressive definition in that it is possible to define a level of income a development threshold below which income does not count toward capability similar to the way typical income tax schedules do not tax income below a certain exemption level in this calculator national capability is calculated as the sum of all individual incomes excluding income below the development threshold capability is measured in market exchange rate mer terms while the development threshold is expressed in purchasing power parity ppp terms and then converted to country specific values using the ratio of mer and ppp exchange rates appropriate to each country this capability is combined with responsibility to calculate a responsibility and capability index which is taken as a measure overall obligation to act for more information see the climate equity reference project approach to equity benchmarking the development threshold defines an income threshold below which an individual s income whatever country they may reside in is taken to be exempt from the calculation of national fair shares which is to say that income below the development threshold is not taken to contribute to national capability nor are emissions corresponding to consumption below this threshold taken to contribute to national responsibility this threshold can be set between 0 and 20 000 per person per year in purchasing power parity terms for reference a development threshold of 7 500 ppp per person per year which is a bit above a reasonably defined global poverty line based on empirical observations is the standard setting presented to the user lower settings can be informative but very low settings are difficult to justify as equitable countries like india which are home to large populations of very poor people are considered to have much more capability when the development threshold is set to 0 than when it is set to 7 500 but this is only evidence of the problematic nature of such settings think of income tax systems and consider that developed countries almost universally exempt extremely poor people from their tax bases very low development thresholds are inconsistent with the conventional progressive approach that virtually all societies have adopted for the purpose of income taxation and they are difficult if not impossible to justify in equity terms for more information see the climate equity reference project approach to equity benchmarking see also luxury threshold the responsibility and capability index rci combines measures of responsibility and capability using a user specified weighting into a combined indicator of national obligation the rci is then used to straightforwardly calculate each country s fair share of the global climate effort a country s fair share of the global effort say in total tons of mitigation required is proportional to its rci a country s rci is affected by its income distribution because both responsibility and capability are calculated in terms of a user specified development threshold for any non zero development threshold the resulting effort sharing allocation if interpreted as a climate tax is mildly progressive in other words a dollar of income that is just above the development threshold is taxed at the same rate as a dollar earned by a billionaire for more information see the climate equity reference project approach to equity benchmarking a nation s overall fair share of the global climate effort is calculated as a percentage of that global effort whether mitigation or adapation related and is based on the country s share of the global responsibility for causing climate change and capability for addressing it these are expressed in a responsibility and capability index which is calculated based on user s own preferred interpretation of national responsibility and capability these preferences are set in the panel to the left labeled calculator settings and a core subset of them are also accessible in the equity settings panel critically a nation s fair share is not seen in domestic terms though its mitigation potential of course is the cerp views climate as a global commons problem that can only be solved within a high cooperation international regime such a regime can only be established if each party sees others to be doing their fair shares in the face of the common challenge in practice of course each country will decide on the basis of its own specific considerations e g it s own view of costs co benefits and political economic tradeoffs what fraction of its fair share of the global effort it will attempt domestically and what fraction it will make off shore by supporting action in other countries the global mitigation requirement is the mitigation gap between emissions under a global business as usual pathway and emissions under the specified global mitigation pathway in any given year for any given bau and mitigation pathway pair this gap can be expressed as a number of gigatonnes of co 2 or co 2 equivalent this is the number of tons to be mitigated in that year this global mitigation requirement can be allocated to individual countries in proportion to their responsibility and capability index to determine their fair share of the global mitigation effort a mitigation pathway is a global emissions trajectory that is designed to over time keep the climate system within a given carbon budget or to keep temperature increases below a certain limit the more stringent the budgetary or temperature limit the higher the level of global ambition the climate equity reference calculator supports three mitigation pathways they range from the 1 5 c low energy demand which is an emergency mitigation pathway by any definition and employs a precautionary approach to negative emissions via beccs to the the 2 c standard pathway that is arguably not consistent with the paris agreement which stipulates well below 2 c as the minumum while also stiving to a return to 1 5 c the 1 5 c low energy demand pathway is a pathway featured centrally in the ipcc s 2018 special report on global warming of 1 5 c it is more stringent than the standard 1 5 c pathway due to its very low energy demand assumptions which in turn facilitate a faster decarbonization of the energy system and allow the pathway to avoid utilization of beccs or orther carbon dioxide removal cdr technology we consider avoidance of beccs cdr an important precautionary approach to mitigation the pathway is described in slightly more detail here page 15 16 the 1 5 c standard pathway is based on the 1 5ºc pathway published by climate action tracker and is estimated to have a greater than or equal to 50 probability of staying below 1 5ºc in 2100 the pathway is based on the median of the scenarios reported in the ipcc s fifth assessment report wgiii that have at least a 50 probability of staying below 1 5ºc cat reports a single all gas median pathway we disaggregate it into fossil co2 lulucf and non co2 pathways using the non co2 pathway from rcp 2 6 the 2 c standard pathway is based on the 2 c pathway published by climate action tracker and is estimated to have a greater than 66 probability of staying below 2 c in 2100 the pathway is based on the median of the scenarios reported in the ipcc s fifth assessment report wgiii that have at least...