**Calculating CO2
emissions**

Here are some conversion factors between fuel used and kg of CO2 put
into the atmosphere

**Fuel Type** |
**CO2 conversion factor** |

Natural Gas: |
2.2 kg/m^3 |

Oil: |
3.0 kg/liter (1 liter = 0.264 US Gallons - see below) |

Gasoline |
2.5 kg/liter |

Electricity |
0.22 kg/kw-hr (depends on mix of fuels used in generating
plant. Link to CO2 energy calculator. |

Public transit |
0.04 kg/km (depends on average number of riders) |

Railway |
0.17 kg/km (depends on number of passengers) |

Air travel |
0.25 kg/km (depends on occupancy) |

1 petajoule = 10^15 joules = 20.778x10^8 kilowatt-hrs

= 9,478x10^-7 Quads = 9.478x10^11 BTUs

1 petaJoule = 163,400 "UN Standard" barrels of oil, or 34,140
"UN Standard" metric tons of coal.

Mass of CO2 = 3.664*(Mass of Carbon)

CO2 release from burning oil= 1.5*(C)2 released by burning natural
gas)

__Other conversions:__