Fig. 6
From: China’s coal mine methane regulations have not curbed growing emissions
Coal CH4 emissions factors. Emissions factors implied by this study, EDGAR v4.34, US EPA9, UNFCCC35, Zhang et al.54, Schwietzke et al.55, Peng et al.6, and Zhu et al.7. The factors implied by this study are in the lower mid-range of existing estimates. In some cases, we divide total emissions by coal production numbers to derive emissions factors for this figure. For example, we divide the EDGAR emissions estimate by EIA coal production estimates1, and we divide Peng et al.6 and China’s UNFCCC report by production numbers from China’s Statistical Yearbook8, the production numbers used in those estimates. The two green lines in this figure are the inversion estimate divided by production numbers from EIA and China’s Statistical Yearbook, respectively. Note that Schwietzke et al.55 and Zhang et al.54 use time-invariant emissions factors, and these studies are therefore represented with solid lines
