Hank 瀚克

The diagram provided elucidates the circulation of carbon dioxide in the natural environment. From an overall perspective, it is apparent that the CO2 cycle can be divided into two disparate processes. One is the CO2 breakdown process, and the other is the CO2 production process.

Looking at the picture in more detail, we can observe that the trees absorb the CO2 in the atmosphere and receive the sunlight to execute the chemistry process, photosynthesis to be specific, simultaneously. Afterwards, by the time the trees expire and the animals produce waste and succumb to natural death, they will turn into organic carbon, subsequently, after a long period of high temperature and pressure, they will become fossils and fossil fuels.

In comparison to the CO2 breakdown process, there are two ways to produce CO2. Firstly, when animals exhale the air from their lungs and plants emit the air from their leaves and roots, the air consists of CO2 and other gases. Last but not least, humans usually exploit fossil fuels to manufacture daily supplies and generate energy for electricity, which creates an abundance of CO2 and permeates the atmosphere. Hence, after animals' respiration and factory emission, CO2 will go back to the atmosphere waiting for the trees to begin their CO2 breakdown process.