Green house gases in the atmosphere are transparent to light but absorb IR radiation. These gases allow sunlight to penetrate the atmosphere and are absorbed by the earth surface. This sunlight is radiated back as IR which is absorbed by gases. As a result the earth surface and lower atmosphere becomes warm. This is called global warming.

EFFECTS OF GLOBAL WARMING:

1.Sea level increases as result of melting and thermal expansion of ocean.

2.Many plants and animal species will have a problem of adapting. Many will be at the risk of extinction, more towering verities will thrive.

3.As the earth becomes warmer the floods and drought becomes more frequent. There would be increase in water-borne diseases.

MEASURES TO CHECK GLOBAL WARMING:

1. CO2 emission can be cut by reducing the use of fossil fuel.

2. Plant more trees.

3. Shifting from coal to natural gas.

4. Stabilize population growth.

5. Remove efficiently CO2 from smoke stocks.

6. Removal atmospheric CO2 by utilizing photo synthetic algae