According to studious researches...
According to studious researches, it gets clear that it may be possible to gain needed oxygen for human from various sources, but the important matter is that this amount of oxygen is as much as the amount that has scattered in the air for man's use. If the earth atmosphere were a little thinner than what is today, heavenly bodies and shooting stars, that cannot reach the earth, would hit the earth million times a day.
These heavenly bodies move 6 to 40 miles per second and if they hit any place, that place will be burnt and destroyed. If their speed were less than what it is, and for example equal to the speed of a bullet, all of them would come to the earth and it is clear that they would destroy everything. If man himself were placed on the way of one of the smallest heavenly bodies, the intensity of the heat of them, that move 90 times faster than a bullet, would rend and destroy him.
The density of the earth atmosphere is to the extent that it allows cosmic rays pass as much as the growth of plants needs. And all harmful microbes are destroyed in the atmosphere and beneficial vitamins are created by them. While there are various vapors that have come out of the depth of the earth during many centuries, nevertheless, the air of the earth does not get polluted and it is always well balanced for the continuity of man's life.
The great machine that creates and keeps such strange balance is the very seas and oceans from which vital and nutritional materials, rain, moderation of air and plants and finally man himself originate. Every person who is able to understand must bow down before the sea and thank it for its favours.
Strange proportion and very exact balance that is between oxygen and carbonic acid gas, that is for creating animal and vegetable life, has attracted the attention of all thinkers and scientists and make them think about it. The importance of carbonic acid gas is still uncovered to many people. It must also be mentioned that carbonic acid gas is the gas that is used for making fizzy drinks. Carbonic acid gas is a heavy and dense gas that is fortunately near the surface of the earth.
It separates from oxygen uneasily and with problem. When a piece of wood is set on fire, wood, which includes oxygen, hydrogen and carbon, is analysed chemically and carbon will be mixed with oxygen very quickly and carbon acid gas is so created. Its hydrogen is quickly mixed with oxygen and water vapour will be created.