Assertion: `CO_(2)` and water vapour present in the atmosphere absorb the re-emitted `IR` radiations from the earth's surface and warm the air.
Reason: For greenhouse effect, presence of green plants is essential.

Assertion: CO_(2) present in the atmosphere absorbs heat radiated from heat radiated from earth in the form of IR radiations. Reason: CO_(2) is a pollutant.

Assertion : CO_2 and methane are called greenhouse gases. Reason : These - radiate heat and radiations cause global warming.

CO_2 and H_2 O absorbs strongly in the infrared region and its presence in the atmosphere decreases the loss of heat from the earth by radiation . This global warming is called the greenhouse effect (other gases , including the oxides of nitrogen from car exhaust freons from aerosols and refrigerators and methane from bacteria in the soil and in the rumen cows , also add to the greenhouse effect ). The concentration of atmospheric CO_2 has increased by 10% . The is resulting in the increase in the mean temperature of the earth by 2. 5^@ C , varying form 2^@ C the equator to 4^@ C at the poles . This could have dramatic effects on the climate. Which of the following is growing at a faster rate than CO_2 and thus responsible for the greenhouse effect ?

Assertion (A) Presence of gree plant is essential for greenhouse effect. Reason (R ) Chlorophyll of green plants causes greenhouse effect.

Assertion (A) Presence of gree plant is essential for greenhouse effect. Reason (R ) Chlorophyll of green plants causes greenhouse effect.

(A): Nowadays surface of the earth gets heated up. (R): CO_2 and water vapour partly reflects IR radiation back to earth's surface.