Global warming is the rise in the average temperatures of the earth. This is caused due to the presence of greenhouse gases.
Which greenhouse gas contributes the most to global warming?
A
Ozone
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B
Carbon dioxide
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C
Sulphur dioxide
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D
Oxygen
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Solution
The correct option is B Carbon dioxide Carbon dioxide is the most abundant greenhouse gas in the atmosphere apart from water vapour. Hence, increase in level of carbon dioxide poses a serious threat to our planet by contributing to global warming.