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Without getting too technical on this answer the main reason is a physics law known as the Ideal Gas Law.

The law is derived from the fact, that in the ideal state of any gas a given number of its "particles" occupy the same volume, and that volume changes are inverse to pressure changes and linear to temperature changes.

With the basis that gravity is the same at equal distances around the planet the pressure variations allow for all the gases of the earths atmosphere to mix equally.

The currently accepted levels for gases in the earths atmosphere are as follows :

N2 - 78.08%

O2 - 20.95%

H2O - 0 to 4%

Ar - 0.93%

CO2 - 0.0360%

Ne - 0.0018%

He - 0.0005%

CH4 - 0.00017%

H2 - 0.00005%

N2O - 0.00003%

O3 - 0.000004%

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Which increases the amount of carbon dioxide in the atmosphere acting as carbon dioxide?

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How does the amount of carbon in the atmosphere stay the same?

The amount of carbon in the atmosphere stays relatively constant through a balance of carbon sources and sinks. Natural processes, like photosynthesis and respiration, regulate the levels of carbon dioxide. However, human activities, such as the burning of fossil fuels, have disrupted this balance by releasing excess carbon dioxide into the atmosphere.


How does respiration affect the amount of carbon dioxide in the atmosphere?

Respiration, breathing, has no effect on the amount of carbon dioxide in the atmosphere. This is part of the natural carbon cycle. Burning fossil fuels (coal, oil and natural gas) releases carbon dioxide that has been hidden away for millions of years. This extra gas is increasing in the atmosphere.


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Would a forest fire affect the amount of carbon dioxide in the atmosphere?

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Will the amount carbon dioxide the atmosphere soon be greater than the Amount of oxygen?

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The amount of carbon dioxide exhaled is always greater than the amount inhaled because part of the oxygen inhaled is converted into carbon dioxide by metabolic processes of digestion, while any carbon dioxide inhaled remains unchanged in the body and is always exhaled again.


Why did the amount of carbon dioxide in the atmosphere stay constant for thousands of years?

The levels of carbon dioxide in the atmosphere stayed constant for thousands of years because of the carbon cycle, which moves carbon throughout the air, oceans and land. There was also no burning of fossil fuels (coal, oil and natural gas), and nobody had cut down the great forests of the world.