11. Discuss briefly the following :

     (a) Greenhouse gases 

Answers (1)
S Sonika

Greenhouse gases-

The gases which cause the greenhouse effect are called greenhouse gases e.g. carbon dioxide, methane, chlorofluorocarbons, nitrous oxide etc. Greenhouse gases allow long wave radiations to enter into the atmosphere but do not let them leave, so these radiations remain trapped in the atmosphere. This causes the greenhouse effect. This is similar to the effect of glass walls in a greenhouse on the plants. The contribution of carbon dioxide, methane, chlorofluorocarbons, nitrous oxide in causing global warming is 60%, 20%,14% and 6% respectively. 

1. Carbon dioxide- The atmospheric concentration of carbon dioxide has risen to 280 ppm in 1750 to 380 ppm in 2007 and until 2019 it has risen to above 400. The main reason for the increase in the combustion of fossil fuels and deforestation. 

2. Methane- The main reason for increase includes incomplete combustions, anaerobic decomposition, chimneys, paddy fields etc. 

3. Chlorofluorocarbons- These are compounds of carbon and halogens used as propellants in aerosols, refrigerants, fire extinguishers, plastic foams, jet fuels etc. 

4. Nitrous oxide-It is formed during the combustion of nitrogen-rich fuels. 

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