Environmental Science
Which one of the following is the correct percentage of the two green house gases that contribute to the total global warming?

CFCs -14%, Methane-20%
CO2-40%,CFCs-30%
N2O-6%, CO2 -86%
Methane-20%, N2O-18%

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Environmental Science
The atmospheric greenhouse effect is produced mainly by the:

Absorption and re-emission of visible light by the ground
Absorption and re-emission of visible light by the atmosphere
Absorption and re-emission of ultraviolet radiation by the atmosphere
Absorption and re-emission of infrared radiation by the atmosphere
Absorption and re-emission of visible light by clouds

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