Discussion
Which of the following gases is responsible, for global warming ?
Answer: D
The gas responsible for global warming is carbon dioxide.
Carbon dioxide is a greenhouse gas: it lets sunlight through but absorbs the heat (infrared radiation) given off by the earth's surface, keeping it in the lower atmosphere. Burning coal, oil and gas and clearing forests have raised its concentration sharply since the industrial revolution, and it is the largest single cause of the present warming.
Oxygen, nitrogen and hydrogen are made of two identical atoms and do not absorb infrared radiation, so they are not greenhouse gases. Oxygen and nitrogen together make up about 99 percent of dry air without trapping heat.
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