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
|
-
E.F. enteric fermentation, M.M. manure management
-
aOur calculations, using IPCC 2006 [4] Tier 1 regional emissions factors