Which of these is NOT a greenhouse gas?*A) MethaneB) OxygenC) Nitrous oxideD) Water vapor

To determine which of the given options is NOT a greenhouse gas, let's first define what greenhouse gases are and the role they play in the Earth's atmosphere.

Greenhouse gases are those that absorb and emit infrared radiation, thereby contributing to the greenhouse effect, which warms the Earth's surface. Some of the common greenhouse gases include:

• Methane (A): A potent greenhouse gas produced through natural processes and human activities, including agriculture and fossil fuel extraction.
• Nitrous oxide (C): Emitted from agriculture, fossil fuel combustion, and various industrial processes, it is also a significant greenhouse gas.
• Water vapor (D): The most abundant greenhouse gas in the atmosphere, though its concentration is mainly controlled by natural processes.

Now, let's analyze option B:

• Oxygen (O2): Though essential for life and a component of the atmosphere, oxygen does not have the properties that allow it to absorb and emit infrared radiation significantly. Therefore, it is not considered a greenhouse gas.

In conclusion, the answer to the question is clearly option B (Oxygen), as it does not contribute to the greenhouse effect in the same manner as the other options listed.

Final Answer

B) Oxygen is NOT a greenhouse gas.