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B
Increasing SO2 concentration
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C
Increasing concentration of chlorofluorocarbons
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D
Hole in ozone layer
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Solution
The correct option is A Increasing CO2 concentration The higher concentration of carbon dioxide in the atmosphere is likely to increase the temperature as carbon dioxide permits the short wavelength visible radiations to pass through it but traps the longer wavelength infrared radiation reflected by earth's surface. This is called the greenhouse effect and it results in the overall increase in the global temperature, called global warming. Carbon dioxide contributes to the 81% of the greenhouse gases because it tends to persist in the atmosphere.
Hence, the correct answer is 'Increasing CO2 concentration'