Earth’s most abundant greenhouse gases are CO₂, CH₄, O₃, CFCs, and water vapour. These gases are present near the Earth’s surface. They absorb solar energy that is radiated back from the surface of the Earth. The absorption of radiation results in the heating up of the atmosphere. Hence, greenhouse gases are essential for maintaining the temperature of the Earth for the existence of life. So, in the absence of greenhouse gases, the average temperature over the earth surface will increase exponentially causing it uninhabitable and barren land.