Question
The true statement about 'green-house effect' is that it is
caused only by CO2
caused by CO2, CFCs, CH4 and NO2 gases
caused by combination of many gases
none of the above
Solution
B.
caused by CO2, CFCs, CH4 and NO2 gases
A Greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range. It causes the greenhouse effect. Green-house effect is caused by CO2, CFCs, CH4 and NO2.
