Question

Which is a green house gas?
A) Methane

B) Chlorofluorocarbons

C) $C{O}_2$

• A. $A$ and $B$
• B. $B$ and $C$
• C. $C$ and $D$
• D. $A,B$ and $C$

Answer 1

The correct option is D $A,B$ and $C$

Greenhouse effect
* The progressive heating up of surface of the earth is earth is called green house effect or global warming.
* $C{O}_2$ and $H_{2}O$ block a part of the heat (IR) emitted by the earth & reflect back. Due to this earth surface gets heated up.
* 50% in $C{O}_2$ content of air can increase the surface temperature of the earth by $3^{o}C$.
* In addition to $C{O}_2$ , the other green - house gases are CFCs (17%), $O_3$ (18%), NO (4%), water vapour (2%).