The Green House Gases are

Question

Accepted Answer

The Green House Gases are: CO_2, CFC, Water-vapour, Methane, NO_2

**Explanation:**

Option 4 is the correct answer because it lists gases that are well-established and significant contributors to the greenhouse effect. Let's break down why each gas in Option 4 is a greenhouse gas:

*   **CO_2 (Carbon Dioxide):** A major greenhouse gas released through burning fossil fuels, deforestation, and industrial processes. It traps heat in the atmosphere and is a primary driver of climate change.

*   **CFCs (Chlorofluorocarbons):** Synthetic compounds formerly used in refrigerants, aerosols, and other applications. While their use has been largely phased out due to their ozone-depleting properties, they are also potent greenhouse gases, trapping significantly more heat per molecule than CO2.

*   **Water-vapour:** The most abundant greenhouse gas in the atmosphere. Its concentration is strongly influenced by temperature; warmer temperatures lead to more evaporation and higher water vapor concentrations, which further amplify warming.

*   **Methane (CH_4):** A powerful greenhouse gas emitted from sources like natural gas and petroleum production, agriculture (especially livestock), and decaying organic matter in wetlands. Methane has a much higher warming potential than CO2 over a shorter period.

*   **NO_2 (Nitrogen Dioxide):** A greenhouse gas emitted from agriculture, industrial activities, and the burning of fossil fuels. It contributes to both global warming and air pollution.

**Why other options are incorrect:**

*   **Option 1: CO_2, CFC, Water-vapour, Methane, Argon:** Argon is an inert noble gas. Inert gases do not react with other substances and do not absorb or emit infrared radiation, so it is not a greenhouse gas.

*   **Option 2: CO_2, CFC, NO_2, Methane, Neon:** Neon is also an inert noble gas, similar to Argon. It does not absorb or emit infrared radiation and therefore is not a greenhouse gas.

*   **Option 3: CO_2, CFC, Water-vapour, Methane, O_2:** O_2 (Oxygen) is essential for respiration but does not significantly contribute to the greenhouse effect. It is transparent to infrared radiation and does not trap heat in the atmosphere.