Last reviewed on November 2, 2011 at 10:05

Documentation of California's Greenhouse Gas Inventory (First Edition - Last updated on 11/19/2007)

♦ Category: Agriculture, Forestry and Other Land Use

IPCC: 3A1ai - Livestock - Enteric Fermentation - Cattle - Dairy Cows
Sector: Agriculture & Forestry : Enteric Fermentation : Cattle

♦ Activity: Livestock population - Dairy cows

♦ Greenhouse gas: Methane ( CH4 )

► Year 1990 —

● Greenhouse gas emission estimate —

Amount: 143,547 tonnes of CH4 Emitted (3,014,481 tonnes CO2 Eq.)
Basis: Model
Calculation: Cattle enteric fermentation model
Reference: [1] - USEPA (2007). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2005. United States Environmental Protection Agency. EPA 430-R-07-002. and Annex 3.10: Methodology for Estimating CH4 and N2O Emissions from Manure Management. DRAFT for public review. February 20, 2007. Washington DC. [2] - Wirth, T. (2007). Personal communication between Neva Lowery of CA Air Resources Board and Tom Wirth, Greenhouse Gas Inventory Source Lead, US Environmental Protection Agency, March 2007.

● Activity level used in calculations —

Activity: Livestock population = 1,115,000 head of Dairy cows
Basis: Model
Calculation: Cattle life cycle model
Reference: [1] - USEPA (2007). Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-2005. United States Environmental Protection Agency. EPA 430-R-07-002. and Annex 3.9: Methodology for Estimating CH4 Emissions from Enteric Fermentation. DRAFT for public review. February 20, 2007. Washington DC. [2] - Wirth, T. (2007). Personal communication between Neva Lowery of CA Air Resources Board and Tom Wirth, Greenhouse Gas Inventory Source Lead, US Environmental Protection Agency, March 2007.
Reference: USDA (2007). U.S. Department of Agriculture, National Agriculture Statistics Service, California Statistics. Available online at: http://www.nass.usda.gov/Statistics_by_State/California/index.asp

● Parameters and Constants used in calculations —

Parameter: Not applicable
Constant: Global warming potential of CH4 = 21
Reference: IPCC (1996). Second Assessment Report. Climate Change 1995: WG I - The Science of Climate Change. Intergovernmental Panel on Climate Change; J.T. Houghton, L.G. Meira Filho, B.A. Callander, N. Harris, A. Kattenberg, and K. Maskell (eds.); Cambridge University Press. Cambridge, U.K.

● Greenhouse gas emitted per unit activity —

Amount: 128,741 g (i.e. 128.74 kg) of CH4 per head of Dairy cows
2,703,571 g (i.e. 2.7 tonnes) of CO2eq. per head of Dairy cows
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