
Gases |
Major Sources |
CO2 |
Incomplete fossil fuel combustion, deforestation, reparation.
The concentration of atmospheric CO2 has been increasing steadily during the
past several decades. It has increased by 25% since 1850. |
 CH4 |
Wetlands, paddy fields, garbage heaps,
anaerobic decomposition of organic wastes. The concentration CH4 in
the atmosphere has considerably increased during the past few decades. The
global warming potential of CH4 is nearly eleven times greater
than that of CO2. |
 N2O |
Natural soils, fertilizers, fossil fuels
combustion, burning forests, grasslands, oceans. The global warming potential
of N2O is nearly 270 times greater that that of CO2. Its
concentration has drastically increased during the immediate past. N2O
is stable gas and an ozone destroyer, with a n average life span of 150
years. |
 O3 |
 Photochemical reactions in troposphere,
diffusion from troposphere. |
 CFC-11 |
Manufacture of foams, aerosol propellant, etc. The
global warming potential of CFCs, in general is 1600-15000 times higher than
that of CO2. |
 CFC-12 |
 Refrigerant, aerosol propellant, manufacture
of foams. |
 CFC-13 |
 Electronic solvent. |
 HCFC-22 |
 Refrigerant, production of
fluoropolymers. |
 CH3CCl3 |
 Industrial degreasing solvent. |
CCl4 |
Intermediate product in the production
CFC-11, CFC-12 etc. |