Global Warming

This time i would like to explain about my opinion about Global Warming that happens now in our earth.
Global Warming is a phenomenom that the sun's heat that go through the earth's atsmosphere and go directly to the earth's surface with the sun shine together..
After that the heat from the sun itself can't go out from the earth, this makes the temperature in the earth itself become hot and hot from time to time, just imagine how if this happen continuously ..
Beside that the pollution that the human makes from their activities like Factory's gas cloud and from their machine transportation that produced CO2 also makes the temperature of this earth worst..
And also because of Air Conditioner that makes the atsmosphere of the earth become decrease each day this can be fatal to all live beings in this earth..
I'll focus on this matter that comes from sun, it's heat is really amazing,things that be a question is How Can The Sun's Shine and Heat Can Go Pass Through The Atsmosphere?
If it can go in why it can go out too?
I think that this because it had a pressure, the sun shine and heat when comes to the earth maybe had a pressure that makes it can easily pass the earth's atsmosphere , but after that why it can't go out from the earth itself ?
I thought that this because of when the heat arrive at the earth's surface it don't have pressure anymore it just become a Gas more correctly just said it Hot Gas, like we know that in this world had 3 kinds of form, it is Solid,Liquid and Gas, so the Hot Gas just wonder around the air with hadn't anywhere or anything to do, it can't go out from the earth because earth also had a Gravitation that makes anything will fall down to the earth, then the Hot Gas just float in the air..
We can't let this happen from day to day, but i understand that this kind of thing can't be dodge  we just can't resist it, we can makes the world green buy plant some kind of plants in our home or at the park this plant can't drain the heat then makes it into O2 this is helpful thought but if we see that most of the earth's part already be less of the plants..
The risk that we may receive if this keep happens is The earth's will covered by the water all of it..
Why i dare to say this? It because as we know that the earth's surface almost 60% or more was a water or sea.. and also at the north and south pole that had many big glacier, just imagine what will happen if all of those glacier melts because of this really heat?
I just can give this because my knowledge is limited though now i still 18 years old but this December I'll be a 19 years old :)
Let us take care our earth for the happiness for our new spirit/successor that will born in the future ^^ keep the good work be done friends :)