How is carbon dioxide added to the air?
When you breathe in, you breathe in oxygen, but when you breathe out, you're breathing out carbon dioxide.
Animal life uses oxygen in respiration, necessary for survival. Carbon Dioxide is released as a by-product. When a tree is burnt or rots it releases its CO2. When we burn fossil fuels (coal, oil and natural gas), for energy or transport we add carbon dioxide to the air.
Carbon dioxide can be added to the air by nature or by people and their activites. Natural ways: * Forest fires * Volcanoes * Decomposition * Animal/plant respiration Man-made contributions: * Burning fuels * Clearing forests by burning * Industrial processes * Releasing carbon dioxide from underground formations
As there is a low level of carbon dioxide in the air that animals (and people) breath, yes every breath taken in breaths in some carbon dioxide. But as carbon dioxide in the blood is transferred to the air in the lungs, increasing the level of carbon dioxide in that air, when they breath out both the carbon dioxide breathed in and the additional carbon dioxide from the blood are breathed out. Thus in balance…
Photosynthesis helps to balance oxygen and carbon dioxide in the air because plants produce oxygen through photosynthesis, this therefore goes into air which humans breathe in. We breathe out carbon dioxide and the plants needs carbon dioxide, so therefore the levels of carbon dioxide and oxygen are balanced in the air.
Carbon dioxide dissolves in water, forming carbonic acid. Only a certain amount can dissolve, however, because at a certain point the water is saturated. So the ocean can remove a certain amount of carbon dioxide from the air (becoming more acidic in the process) but it can't remove all of the excess that has been added.