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Table 5 Comparison of livestock CH4 C emissions reported in literature to revised values obtained in this study

From: Revised methane emissions factors and spatially distributed annual carbon fluxes for global livestock

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 2006a Bottom-up 81.3 ± 12.4 90.4 ± 13.8
IPCC 2006 [36] 81.0
E.F. CH4 C IPCC 2006a Bottom-up 74.2 ± 11.4 80.6 ± 12.3
IPCC 2006 [36] 73.8
M.M. CH4 C IPCC 2006a Bottom-up 7.14 ± 1.09 9.79 ± 1.5
IPCC 2006 [36] 7.24
Globe 2012 Total lvstk. CH4 C IPCC 2006a Bottom-up 80.9 ± 12.4 90.08 ± 13.78
IPCC 2006 [36] 80.6  
E.F. CH4 C IPCC 2006a Bottom-up 73.8 ± 11.3 80.3 ± 12.3
IPCC 2006 [36] 73.4  
M.M. CH4 C IPCC 2006a Bottom-up 7.10 ± 1.1 9.81 ± 1.5
IPCC 2006 [36] 7.19  
Globe 2009–2011 Total lvstk. CH4 C [20] Top-down 88.94 87.88 ± 13.44 (2009)
89.35 ± 13.67 (2011)
Globe 2010 E.F. CH4 C [88] Bottom-up 69.0 79.0 ± 12.1
M.M. CH4 C 8.19 9.51 ± 1.5
Globe 2000s (average) E.F. CH4 C [49] Bottom-up 70.0 ± 3.3 72.0 ± 11.0
M.M. CH4 C 8.0 ± 0.3 8.4 ± 1.29
US 2012 E.F. CH4 C IPCC 2006a Bottom-up 4.38 ± 0.67 4.95 ± 0.76
IPCC 2006 [36] 4.4
[89] 5.0
M.M. CH4 C IPCC 2006a 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 2006a Bottom-up 0.230 ± 0.035 0.382 ± 0.058 (2013)
[51] Top-down 0.603–1.06
All non-dairy lvstk. CH4 C IPCC 2006a Bottom-up 0.15 ± .022 0.168 ± 0.026 (2013)
[51] Top-down 0.149–0.259
California 2010 Total lvstk. CH4 C IPCC 2006a Bottom-up 0.38 0.54 ± 0.08
[5, as analyzed in 22] 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] 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
M.M. CH4 C 8.65 9.14 ± 1.4
US 2004 Total lvstk. CH4 C IPCC 2006a Bottom-up 5.5 6.42 ± 0.98
[92] 5.8
[21] Top-down 9.15 ± 0.98
  1. E.F. enteric fermentation, M.M. manure management
  2. aOur calculations, using IPCC 2006 [4] Tier 1 regional emissions factors