Consider the following statements 1 GreenHouse Effect supports the existence of life on earth 2 Gree...........

Environment and Ecology Others

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Consider the following statements

1. GreenHouse Effect supports the existence of life on earth.

2. Greenhouse gases in the air absorb ultraviolet light containing heat.

3. Methane traps more heat per molecule than carbon dioxide.

4. Global warming leads to the spread of vector-borne diseases.

Which of the above statement/s is/are correct?

1 only

2 and 3 only

4 only

1, 3 and 4 only

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Explanation:

The green-house effect is a natural phenomenon and has been occurring for millions of years on the earth.

Life on the earth has been possible because of this natural greenhouse effect which is due to water vapour and small particles of water present in the atmosphere.

Together, these produce more than 95 percent of total greenhouse warming.

Average global temperatures are maintained at about 15°C due to natural greenhouse effect.

Without this phenomenon, average global temperatures might have been around –17°C and at such low temperature life would not be able to exist.

Atmospheric gases like carbon dioxide, methane, nitrous oxide (N2O), water vapour, and chlorofluorocarbons are capable of trapping the out-going infrared radiation from the earth’s surface thereby causing greenhouse effect.

Hence these gases are known as greenhouse gases and the heating effect is known as greenhouse effect.