Combustion of Fuels - Carbon Dioxide Emission

To calculate the CO₂ emission from a fuel the carbon content of the fuel must be multiplied with the ratio of molecular weight CO₂(44) to the molecular weight Carbon 12 -> 44 / 12 = 3.7
Carbon Dioxide emission can be calculated as

q_CO2 = c_f / h_f  C_CO2/C_m         (1)
where
q_CO2 = specific CO₂ emission (CO₂/kWh)
c_f = specific carbon content in the fuel (kg_C/kg_fuel)
h_f = specific energy content (kWh/kg_fuel)
C_m = specific mass Carbon (kg/mol Carbon)
C_CO2 = specific  mass Carbon Dioxide (kg/mol CO₂)

Emission of Carbon Dioxide - CO₂ - when combustion some common fuels are indicated in the table below.
Note! Heat loss - 55-75% - in power generation is not included in the numbers.  
¹⁾ Commonly viewed as a Bio fuel
²⁾ Bio Energy is produced from biomass derived from any renewable organic plant, including

• dedicated energy crops and trees
• agricultural food and feed crops
• agricultural crop wastes and residues
• wood wastes
• aquatic plants
• animal wastes
• municipal wastes and other waste materials

Emissions of CO₂ can contribute to climate change. Combustion of bio energy don't add to the total emission of carbon dioxide as long as the burned bio mass don't exceed the renewed production. The recycling of carbon from wood combustion is virtually instantaneous and continuous and it is also common to regard the net supply of CO₂ to the atmosphere from combustion of wood close to zero.
A variety of bio fuels can be made from biomass resources, including

• ethanol
• methanol
• biodiesel
• Fischer-Tropsch diesel
• gaseous fuels like hydrogen or methane