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Which gas is considered a ‘Trace Gas’ despite its massive impact on the greenhouse effect?
Methane (CH4) is a trace gas because it exists in very small concentrations (about 1.9 parts per million). However, it is a potent greenhouse gas, roughly 25 to 30 times more effective at trapping heat than carbon dioxide over a century. Its concentration is rising due to agriculture, landfill waste and the thawing of permafrost. ANSWER: (C) Methane
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