Table 3. Listing of the primary and secondary fuels from the United Nations Energy Statistics
Database used in calculating CO2-emission estimates. The two-letter commodity code
used by he United Nations for each fuel type is shown in parentheses.

Gas Fuels
Primary gas fuels Secondary gas fuels
Natural gas (NG) Gasworks gas (GG)
Coke-oven gas (OG)
Refinery gas (RG)
Liquid Fuels
Primary liquid fuels Secondary liquid fuels
Crude petroleum (CR) Aviation gasoline (AV)
Natural gas liquids (GL) Plant condensate (CD)
Gas-diesel oils (DL)
Feedstocks (FS)
Jet fuel (JF)
Kerosene (KR)
Liquefied petroleum gas (LP)
Motor gasoline (MO)
Natural gasoline (NT)
Residual fuel oils (RF)
Secondary nonenergy liquid fuels
Bitumen/asphalt (BT)
Lubricants (LU)
Naphthas (NP)
Petroleum coke (PK)
Other petroleum products (PP)
Petroleum waxes (PW)
White spirit/industrial spirit (WS)
Solid Fuels
Primary solid fuels Secondary solid fuels
Coal (CL) Lignite (brown coal) briquettes (BB)
Lignite/brown coal (LB) Hard coal (patent fuel) briquettes (BC)
Oil shale (OS) Brown coal coke (BK)
Peat (PT) Peat briquettes (BP)
Gas coke (GK)