Research the amount of carbon dioxide generally found in the air and in breath. which has more carbon dioxide? what are some of the other sources of carbon dioxide in air?

In atmosphere there is 0.04 % of co2 in the air
In breath we breath out about 2 to 3 pounds of  co2 which is greater than the amount of co2 found in air \
The sources of co2 are
respiration 
combustion of organic fuels or compounds