A. any gas in Earth's atmosphere
B. any gas in the troposphere that absorbs and re-emits infrared radiation
C. a gas that forms a physical barrier to block escaping heat
D. a gas at higher temperature than the surrounding atmosphere
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The correct answer is B. any gas in the troposphere that absorbs and re-emits infrared radiation.
Greenhouse gases, such as carbon dioxide, methane, and water vapor, play a key role in the greenhouse effect by trapping heat in the atmosphere and thereby contributing to global warming.
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