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:

  • 1 liter = 0.264 US Gallons = 0.001 cub1ic meter = 1,000 cubic cm
  • 1 metric ton (tonne)= 2204.62 pounds = 1,000 kg
  • 1 ton (US) = 2,000 pounds = 907.185 kg

'Three to five trees planted will fix about one tonne of CO2'

Although it is impossible to reach a precise formula, every three to five trees planted will 'fix' about one tonne of CO2 over time.