Through the main paper we use household per adult equivalent as our unit of analysis, following the EUROSTAT HBS. This meant that we adjusted decarbonisation scenario final energy numbers from total per capita to household per adult equivalent to better compare them with our environmental footprint estimates. We adjusted them for 1) the household share of the total footprint, and 2) the adult equivalent share of the total population.
As a numerical example, we adjust a total final energy of 53 GJ per capita from the LED scenario (Grubler et al. (2018) [@grubler_low_2018]), first by the household share of the total European energy footprint in 2015 (around 0.62, calculated in EXIOBASE), and then the share of total adult equivalents in the total European population in 2015 (also around `r ae_share_of_pop`, calculated using the EUROSTAT HBS, number of households per country, and population data per country). A total final energy of 53 GJ/capita is therefore adjusted to a household final energy of 53 GJ/adult equivalent in Europe ((53 total GJ/capita * 0.62 household share of total footprint)/0.62 adult equivalent share of total population = 53 household GJ/adult equivalent).
As a numerical example, we adjust a total final energy of 53 GJ per capita from the LED scenario (Grubler et al. (2018) [@grubler_low_2018]), first by the household share of the total European energy footprint in 2015 (around 0.63, calculated in EXIOBASE), and then the share of total adult equivalents in the total European population in 2015 (also around `r ae_share_of_pop`, calculated using the EUROSTAT HBS, number of households per country, and population data per country). A total final energy of 53 GJ/capita is therefore adjusted to a household final energy of 53 GJ/adult equivalent in Europe ((53 total GJ/capita * 0.63 household share of total footprint)/0.63 adult equivalent share of total population = 53 household GJ/adult equivalent).
The decarbonisation scenario final energy numbers in 2050, presented in Table 1 of the main paper, were originally in total GJ per capita: 94 GJ/capita (SSP2-1.9), 87 GJ/capita (SSP1-1.9), 84 GJ/capita (IEA ETP B2DS), 64 GJ/capita (GEA-efficiency), 53 GJ/capita (LED), and 15.3 GJ/capita (DLE). Because of the similar relative shares of the household part of the total European energy footprint (~0.62), and the adult equivalent share of the total population in our sample (also around 0.62), these final energy numbers end up close to the same when adjusted to household per adult equivalent. The original numbers for the SSP and GEA-efficiency scenarios are from the International Institute for Applied Systems Analysis (IIASA) scenario database [@riahi_shared_2017 @gea_gea_nodate]. The SSP total GJ/capita numbers are for the OECD region, while the GEA-efficiency total GJ/capita number is for their 'West EU' region. The LED total GJ/capita number is from Grubler et al. (2018) [@grubler_low_2018], and the IEA ETP B2DS total GJ/capita number is from the Supplementary Table 27 in the supplementary information document of Grubler et al. (2018) [@grubler_low_2018]. The LED and IEA ETP B2DS total GJ/capita numbers are both for the Global North region. We also refer in the main paper to the LED numbers for the Global South (20 total GJ/capita) and the world (27 total GJ/capita). Finally, the DLE number is one number for the world, and while they give a range of 13-18.4 total GJ/capita, we take their average of 15.3 total GJ/capita [@millward-hopkins_providing_2020].
The decarbonisation scenario final energy numbers in 2050, presented in Table 1 of the main paper, were originally in total GJ per capita: 94 GJ/capita (SSP2-1.9), 87 GJ/capita (SSP1-1.9), 84 GJ/capita (IEA ETP B2DS), 64 GJ/capita (GEA-efficiency), 53 GJ/capita (LED), and 15.3 GJ/capita (DLE). Because of the similar relative shares of the household part of the total European energy footprint (~0.63), and the adult equivalent share of the total population in our sample (also around 0.63), these final energy numbers end up close to the same when adjusted to household per adult equivalent. The original numbers for the SSP and GEA-efficiency scenarios are from the International Institute for Applied Systems Analysis (IIASA) scenario database [@riahi_shared_2017 @gea_gea_nodate]. The SSP total GJ/capita numbers are for the OECD region, while the GEA-efficiency total GJ/capita number is for their 'West EU' region. The SSP numbers are from the MESSAGE-GLOBIOM model, and the GEA-efficiency number is from the MESSAGE model. The LED total GJ/capita number is from Grubler et al. (2018) [@grubler_low_2018], and the IEA ETP B2DS total GJ/capita number is from the Supplementary Table 27 in the supplementary information document of Grubler et al. (2018) [@grubler_low_2018]. The LED and IEA ETP B2DS total GJ/capita numbers are both for the Global North region. We also refer in the main paper to the LED numbers for the Global South (20 total GJ/capita) and the world (27 total GJ/capita). Finally, the DLE number is one number for the world, and while they give a range of 13-18.4 total GJ/capita, we take their average of 15.3 total GJ/capita [@millward-hopkins_providing_2020].
Our European expenditure deciles were constructed having the exact same number of adult equivalents per decile. When comparing with external per capita numbers, however, there are not the same number of population per decile because of differences in non-adult-equivalent-normalized people per household between income quintiles per country, and between countries. In Figure Sx we show an estimate of population per European expenditure decile. We use this to re-estimate our energy footprint per European expenditure decile in per capita terms, and then re-create Figure 5 from the main paper (Figure Sxx below) in per capita terms.
## Figure 5 from manuscript in household final energy per capita
Here we re-create Figure 5 from the main paper after estimating our energy footprint per European expenditure decile in per capita terms (using the population per decile estimates from above), instead of per adult equivalent terms. Now we only adjust the decarbonisation scenario final energy numbers from total GJ per capita to household GJ per capita, so, for example, 53 total GJ/capita becomes: 53 * 0.62 = 33 household GJ/capita.
Here we re-create Figure 5 from the main paper after estimating our energy footprint per European expenditure decile in per capita terms (using the population per decile estimates from above), instead of per adult equivalent terms. Now we only adjust the decarbonisation scenario final energy numbers from total GJ per capita to household GJ per capita, so, for example, 53 total GJ/capita becomes: 53 * 0.63 = 33 household GJ/capita.
