Discussion
Which of the following is/are greenhouse gas/gases?
Answer: D
The answer is All of the above.
Greenhouse gases absorb the heat (infrared radiation) given off by the Earth's surface and re-emit it, keeping the planet warm. Carbon dioxide, from burning fuels and deforestation, is the best known. Methane, from paddy fields, cattle and landfills, traps much more heat per molecule. Water vapour is in fact the most abundant greenhouse gas.
Since all three listed gases are greenhouse gases, choosing any one of them alone would be incomplete.
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