The correct answer is: Carbon dioxide (CO2).
Carbon dioxide is a greenhouse gas that is naturally present in the atmosphere. It is one of the gases that absorbs and re-emits energy in the form of infrared radiation, which helps to keep the Earth’s temperature warm. However, human activities, such as burning fossil fuels, are increasing the amount of carbon dioxide in the atmosphere. This is causing the Earth’s temperature
to rise, which is leading to climate change.Ozone (O3) is another greenhouse gas, but it is not as important as carbon dioxide. Ozone is found in the stratosphere, which is the layer of the atmosphere above the troposphere. The stratosphere contains about 90% of the ozone in the atmosphere. Ozone absorbs ultraviolet radiation from the sun, which helps to protect life on Earth from the harmful effects of this radiation.
Nitrogen (N2) and oxygen (O2) are not greenhouse gases. They do not absorb and re-emit energy in the form of infrared radiation. Nitrogen is the most abundant gas in the atmosphere, making up about 78% of the total volume. Oxygen is
the second most abundant gas, making up about 21% of the total volume. These gases are essential for life on Earth.In conclusion, the atmospheric gas that is mainly responsible for greenhouse effect is carbon dioxide.