. 2017 Sep 29;12:16. doi: 10.1186/s13021-017-0084-y

Table 5.

Comparison of livestock CH₄ C emissions reported in literature to revised values obtained in this study

Area	Years	Methane quantity	Source/emissions factors used	Method	Value (Tg C year⁻¹)	Revised value (Tg C year⁻¹)
Globe	2013	Total lvstk. CH₄ C	IPCC 2006^a	Bottom-up	81.3 ± 12.4	90.4 ± 13.8
		Total lvstk. CH₄ C	IPCC 2006 [36]	Bottom-up	81.0	90.4 ± 13.8
		E.F. CH₄ C	IPCC 2006^a	Bottom-up	74.2 ± 11.4	80.6 ± 12.3
		E.F. CH₄ C	IPCC 2006 [36]	Bottom-up	73.8	80.6 ± 12.3
		M.M. CH₄ C	IPCC 2006^a	Bottom-up	7.14 ± 1.09	9.79 ± 1.5
		M.M. CH₄ C	IPCC 2006 [36]	Bottom-up	7.24	9.79 ± 1.5
Globe	2012	Total lvstk. CH₄ C	IPCC 2006^a	Bottom-up	80.9 ± 12.4	90.08 ± 13.78
		Total lvstk. CH₄ C	IPCC 2006 [36]	Bottom-up	80.6
		E.F. CH₄ C	IPCC 2006^a	Bottom-up	73.8 ± 11.3	80.3 ± 12.3
		E.F. CH₄ C	IPCC 2006 [36]	Bottom-up	73.4
		M.M. CH₄ C	IPCC 2006^a	Bottom-up	7.10 ± 1.1	9.81 ± 1.5
		M.M. CH₄ C	IPCC 2006 [36]	Bottom-up	7.19
Globe	2009–2011	Total lvstk. CH₄ C	[20]	Top-down	88.94	87.88 ± 13.44 (2009)
Globe	2009–2011	Total lvstk. CH₄ C	[20]	Top-down	88.94	89.35 ± 13.67 (2011)
Globe	2010	E.F. CH₄ C	[88]	Bottom-up	69.0	79.0 ± 12.1
Globe	2010	M.M. CH₄ C	[88]	Bottom-up	8.19	9.51 ± 1.5
Globe	2000s (average)	E.F. CH₄ C	[49]	Bottom-up	70.0 ± 3.3	72.0 ± 11.0
Globe	2000s (average)	M.M. CH₄ C	[49]	Bottom-up	8.0 ± 0.3	8.4 ± 1.29
US	2012	E.F. CH₄ C	IPCC 2006^a	Bottom-up	4.38 ± 0.67	4.95 ± 0.76
			IPCC 2006 [36]		4.4
			[89]		5.0
		M.M. CH₄ C	IPCC 2006^a	Bottom-up	1.09 ± 0.17	1.93 ± 0.3
			IPCC 2006 [36]		1.02
			[89]		1.91
US	2009–2011	Total lvstk. CH₄ C	[90]	Top-down	8.75–14.09	6.83 ± 1.05 (2009) 6.90 ± 1.06 (2011)
			[91]	Bottom-up	6.82 (2010); 6.77 (2011)
			[12]		7.02 (2010); 6.97 (2011)
			[89]		6.97 (2010); 6.91 (2011)
California	2013–2014	Dairy cattle CH₄ C	IPCC 2006^a	Bottom-up	0.230 ± 0.035	0.382 ± 0.058 (2013)
		Dairy cattle CH₄ C	[51]	Top-down	0.603–1.06	0.382 ± 0.058 (2013)
		All non-dairy lvstk. CH₄ C	IPCC 2006^a	Bottom-up	0.15 ± .022	0.168 ± 0.026 (2013)
		All non-dairy lvstk. CH₄ C	[51]	Top-down	0.149–0.259	0.168 ± 0.026 (2013)
California	2010	Total lvstk. CH₄ C	IPCC 2006^a	Bottom-up	0.38	0.54 ± 0.08
			[5, as analyzed in 22]	Bottom-up	0.35
			[22]	Top-down	0.65
US	2008	Total lvstk. CH₄ C	[5, as analyzed in 23]	Bottom-up	6.7	6.88 ± 1.05
			[12]	Bottom-up	7.09
			[23]	Top-down	12.7 ± 0.5
Globe	2008	E.F. CH₄ C	[Sum over all gridcells from 5]	Bottom-up	75.12	77.82 ± 11.91
Globe	2008	M.M. CH₄ C	[Sum over all gridcells from 5]	Bottom-up	8.65	9.14 ± 1.4
US	2004	Total lvstk. CH₄ C	IPCC 2006^a	Bottom-up	5.5	6.42 ± 0.98
			[92]	Bottom-up	5.8
			[21]	Top-down	9.15 ± 0.98

E.F. enteric fermentation, M.M. manure management

^aOur calculations, using IPCC 2006 [4] Tier 1 regional emissions factors