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: Energy

IPCC: 1A4c - Fuel Combustion Activities - Other Sectors - Agriculture/Forestry/Fishing/Fish Farms
Sector: Agriculture & Forestry : Ag Energy Use

♦ Activity: Fuel combustion - Natural gas

♦ Greenhouse gas: Methane ( CH4 )

► Year 1990 —

● Greenhouse gas emission estimate —

Amount: 3.113E-02 tonne of CH4 Emitted (0.654 tonne CO2 Eq.)
Basis: Calculation
Calculation: [Fuel combustion] * [Heat content] * [Fuel CH4 emission]
Reference: IPCC (1997). Revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories (Revised Guidelines). Intergovernmental Panel on Climate Change. Published: IGES, Japan.

● Activity level used in calculations —

Activity: Fuel combustion = 6,030,964 scf of Natural gas
Basis: Data
Reference: DATA NOT AVAILABLE -Value for this year is assumed to be equal to the average value for years 2002-2004.

● Parameters and Constants used in calculations —

Parameter: Fuel CH4 emission = 5.000E-06 g / btu
Reference: IPCC (2006). 2006 IPCC Guidelines for National Greenhouse Gas Inventories, Prepared by the National Greenhouse Gas Inventories Programme, Eggleston H.S., Buendia L., Miwa K., Ngara T., and Tanabe K. (eds). Volume 2, Chapter 2: Energy.
Parameter: Heat content = 1,032 btu / scf
Reference: EIA (2007). Energy Information Administration. State Energy Consumption, Price, and Expenditure Estimates (SEDS). Available online at:
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: 5.162E-03 g of CH4 per scf of Natural gas
0.108 g of CO2eq. per scf of Natural gas