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B
Hydrogen
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C
Carbon dioxide
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D
Chlorofluorocarbons
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Solution
The correct option is B
Hydrogen
The explanation for the correct option:
(B) Hydrogen
A greenhouse gas is a gas that contributes to the greenhouse effect by absorbing infrared radiation.
The greenhouse effect is the trapping of the sun's heat in a planet's lower troposphere in order to keep Earth warm and protect it from cosmic cold winds. An increase in greenhouse gases increases heat, giving rise to global warming.
Hydrogen gas is not a greenhouse gas as it does not absorb any sort of heat.
The explanation for incorrect options:
(A) Methane
Methane is one of the major greenhouse gas.
It reacts with atmospheric water vapor or oxygen forming carbon dioxide which increases the temperature of the Earth's atmosphere.
About an increase in global warming is observed due to methane.
(C) Carbon Dioxide
Carbon dioxide is a huge impact on global warming and is a greenhouse gas.
The emission of this gas is mostly due to human activities like the burning of fossil fuels, emissions from automobiles, etc.
Carbon dioxide is an air pollutant as well.
(D) Chlorofluorocarbons
Chlorofluorocarbons are present in small quantities but are one of the most powerful greenhouse gas.
It is around times harmful and it destroys the ozone layer present in the stratosphere.
It absorbs heat in the lower atmosphere hence increasing temperature and global warming.