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%
The amount is increased. Co2 is a greenhouse gas.
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.
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.
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.
Coal is almost all carbon plus impurities. Burning it combines it with oxygen forming carbon dioxide.
Atmospheric carbon dioxide levels are increasing because human activities, such as burning fossil fuels, release more carbon dioxide into the atmosphere than natural processes can remove. This imbalance leads to a buildup of carbon dioxide in the atmosphere, even though the total amount of carbon on Earth remains relatively constant.
The amount is increased. Co2 is a greenhouse gas.
The amount of carbon dioxide a person produces
In pre-industrial times, the amount of carbon dioxide (CO2)that animals breathe out was matched by the amount absorbed by plants, so that the concentration of atmospheric carbon dioxide remained remarkably stable in the range of 260 to 280 parts per million (ppm) over a very long period. Adding additional carbon dioxide by burning fossil fuels, overwhelms the carbon cycle and causes the atmospheric concentration of carbon dioxide to rise beyond this range. Deforestation can break the carbon cycle, first by removing a store of carbon which will be released as additional carbon dioxide into the atmosphere, and in some cases by reducing the ability of nature to absorb carbon dioxide from the air.
Respiration :)
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.
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.
Henry's law constant for Carbon Dioxide at 20 degrees Celsius is: 1,6*10^3 ATM
Forest fires increase the amount of carbon dioxide in the atmosphere
No, the amount of oxygen in the atmosphere is much greater than the amount of carbon dioxide. The current levels of carbon dioxide are approximately 0.04% of the atmosphere, while oxygen levels are around 21%.
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.
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.