What would have happened if the greenhouse gases were totally missing in the earth's atmosphere? Discuss.

(N/A) The primary greenhouse gases in the earth's atmosphere are $CO_{2}$,$CH_{4}$,$O_{3}$,$CFCs$,and water vapor.
These gases trap heat by absorbing infrared radiation emitted from the earth's surface,which keeps the planet warm.
If greenhouse gases were totally missing,the heat absorbed from solar energy would escape back into space.
As a result,the earth's average temperature would drop significantly,potentially reaching below $0 \ ^{\circ}C$.
This extreme cooling would make the planet unfit for life as we know it,rendering the existence of living organisms impossible.