Emissions of carbon dioxide, methane,
and nitrous oxide, 1990-98:
U.S. and agricultural sector
|
| Year |
1990 |
1991 |
1992 |
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
| Total emissions
(MMT carbon equivalent -- MMTCE) |
| Carbon |
1340.3 |
1326.1 |
1350.4 |
1383.3 |
1404.8 |
1416.5 |
1466.2 |
1486.4 |
1494.0 |
| Methane |
177.9 |
177.7 |
179.4 |
178.7 |
181.6 |
184.1 |
183.1 |
183.8 |
180.9 |
| Nitrous
oxide |
108.2 |
110.5 |
113.3 |
113.8 |
121.5 |
118.8 |
121.5 |
122.4 |
119.4 |
| Total emissions* |
1649.7 |
1636.2 |
1666.6 |
1699.7 |
1733.0 |
1748.5 |
1804.4 |
1827.9 |
1834.6 |
| Total net
emissions** |
1333.3 |
1320.0 |
1350.5 |
1487.0 |
1520.7 |
1536.6 |
1593.1 |
1616.8 |
1623.8 |
| U.S. methane
emissions from agricultural sources (MMTCE) |
| Enteric
fermentation |
32.7 |
32.8 |
33.2 |
33.7 |
34.5 |
34.9 |
34.5 |
34.2 |
33.7 |
| Manure management |
15.0 |
15.5 |
16.0 |
17.1 |
18.8 |
19.7 |
20.4 |
22.1 |
22.9 |
| Rice cultivation |
2.4 |
2.3 |
2.6 |
2.4 |
2.7 |
2.6 |
2.4 |
2.6 |
2.7 |
| Crop residue burning |
0.2 |
0.2 |
0.2 |
0.1 |
0.2 |
0.2 |
0.2 |
0.2 |
0.2 |
| Agricultural
sources |
50.3 |
50.8 |
52.0 |
53.3 |
56.2 |
57.4 |
57.5 |
59.1 |
59.5 |
| Percent agriculture |
28.3 |
28.6 |
29.0 |
29.8 |
30.9 |
31.2 |
31.4 |
32.2 |
32.9 |
| U.S. nitrous
oxide emissions from agricultural sources (MMTCE) |
| Soil management |
75.3 |
76.3 |
78.2 |
77.3 |
83.5 |
80.4 |
82.4 |
84.2 |
83.9 |
| Manure management |
3.4 |
3.6 |
3.5 |
3.7 |
3.8 |
3.7 |
3.8 |
3.9 |
4.0 |
| Crop residue
burning |
0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
0.1 |
| Agricultural sources |
78.8 |
80.0 |
81.8 |
81.1 |
87.4 |
84.2 |
86.3 |
88.2 |
88.0 |
| Percent
agriculture |
72.8 |
72.4 |
72.2 |
71.3 |
71.9 |
70.9 |
71.0 |
72.1 |
73.7 |
| Source: EPA, 2000
(http://www.epa.gov/globalwarming/publications/emissions/index.html) |
| * Includes emissions
of hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride.
|
| ** Includes estimates
of net carbon sequestration due to land-use change and forestry. |
