Table 2.
Estimates of California Total Emissions in Gigagrams of CH4 Per Year from CARB (2017a), CALGEM v2.2 (Jeong et al., 2012), GEPA (Maasakkers et al., 2016), and EDGAR v4.2FT (EDGAR, 2011)
| CARB | CALGEM | GEPA | EDGAR | |
|---|---|---|---|---|
| Year | 2013 | 2010 | 2012 | 2008 |
| Total | 1615 | 1282 | 1898 | 1849 |
| Biogenic | 1318 | 1138 | 1552 | 1272 |
| Fossil | 298 | 144 | 346 | 577 |
| Fossil fraction | 18% | 11% | 18% | 31% |
Note. Emissions are separated by type: biogenic (e.g., livestock, landfill, wastewater, rice farming, and biomass burning) or fossil (e.g., natural gas, petroleum, and combustion). The year corresponding to each estimate is given in the first row, and the fossil fraction is given in the last row. Specific sectors included for GEPA and EDGAR are listed in Table S1.