TABLE 1.

Components of the total bottom‐up emission estimates and references

Sector abbreviation	Subsector	Information type	Bottom‐up estimate
			CEDS	EDGAR	GAINS	USEPA
Fossil	Total Fossil	Temporally and spatially varying	CEDS (Hoesly et al., 2018)	EDGAR v4.3.2 (Janssens‐Maenhout et al., 2019)	GAINS ECPLISE v6 (Höglund‐Isaksson et al., 2020)	USEPA (USEPA, 2012)
Ag&Waste	Agriculture and waste
BB&F	Biofuels
	Biomass Burning		BB4CMIP (van Marle et al., 2017)		GFEDv4.1s (van der Werf et al., 2017)
Wetl	Wetlands		Ensemble mean of wetlands models (Saunois et al., 2020; Zhang et al., 2021)
Non‐Wetl	Geological	Spatially but not temporally varying	Etiope et al. (2019)
	Termites		Kirschke et al. (2013), Saunois et al. (2016) and Saunois et al. (2020)
	Oceanic (biogenic) including estuaries and blue carbon		Ocean total of 6 Tg CH4 yr−1 as described in Saunois et al. (2020)
	Inland waters – lakes and reservoirs*		This paper Section 2.1.4 and Supplementary S4.
	Wild animals	Global totals only	Excluded from total
	Permafrost soils

^*The inland water estimate was developed for this study and was not used in Saunois et al. (2020).