Fig. 2: The methane conversion gap.
From: Lack of harmonisation of greenhouse gases reporting standards and the methane emissions gap
a, e shows the cumulative value of the methane conversion gap over time, i.e., the sum of the yearly differences between reported methane emissions and emissions computed under the most recent GWP100(GWP20). The trifurcation of the solid lines from year 2021 shows the gap under the fossil and non-fossil GWPs from AR6, as well as their average. b, f shows the cumulative distribution of the methane conversion gap across companies under the most recent GWP100(GWP20). c, g shows the cumulative value of methane emissions as reported and as expected under the most recent GWP100(GWP20) (N = 9375).d, h left y-axis shows the average methane conversion gap across key sectors under the 100-year (20-year) counterfactual. The error bars are standard errors of the mean (N = 8713); low methane emission sectors and the bottom 1% of the gap distribution are excluded from the visualisation and the estimation of the averages. The grey dot-dashed line shows the sample averages across time, whereas the grey shading shows the standard errors. The black dotted line in the right y-axis shows the total gap over the sample, including all sectors, by year.
