The correct answer is (a) Nitrogen.
Nitrogen is not a greenhouse gas because it does not absorb infrared radiation. The other three options, carbon dioxide, methane, and water vapor, are greenhouse gases because they do absorb infrared radiation.
Nitrogen is the most abundant gas in the Earth’s atmosphere, making up about 78% of the air. It is a colorless, odorless, and tasteless gas that is essential for life. Nitrogen is used by plants to produce proteins and other organic compounds. It is also used in fertilizers, explosives, and other industrial products.
Carbon dioxide is a greenhouse gas that is produced when fossil fuels are burned. It is also released into the atmosphere when plants and animals decompose. Carbon dioxide is a major contributor to climate change.
Methane is a greenhouse gas that is produced by the decomposition of organic matter. It is also released into the atmosphere by livestock, landfills, and natural gas leaks. Methane is a more potent greenhouse gas than carbon dioxide.
Water vapor is a greenhouse gas that is produced when water evaporates. It is also released into the atmosphere by plants and animals. Water vapor is the most abundant greenhouse gas in the Earth’s atmosphere.