Most abundant greenhouse gases on the earth are cabondioxide (CO2),methane(CH4),ozone(O3), CFCs, and water vapour. These gases are present near to the surface of earth.These green house gases absorb the solar energy that is radiated back from the surface of the Earth. The absorption of these radiation leads to the increase in temperature of the atmosphere.
Therefore greenhouse gases are too much essential for maintaining the temperature of the surface of Earth.
If the greenhouse gases is not present then, the average temperature of the Earth surface will decrease drastically, making it uninhabitable.thus without green house gases the life on Earth would be impossible.
Regards