The picture reveals how the natural carbon cycle system runs. The processes go through the sun, trees, animals, and human beings’ activities. The steps work as a circle and continue. The details are as follows.
First, plants have a chemical reaction with sunlight and CO2, which is called photosynthesis. After that, organic carbon is produced. Moreover, it is not only from plants, it is also released by organic decay, dead animals, and waste. After a few decades, these things will change into fossil fuels, which are very important raw materials for humans.
Second, animals and plants respire, breathing out CO2, and then the CO2 rises. Apart from the two former’s respiration, CO2 is also produced by human industrial activities, which are emitted from factories and vehicles. Tons of CO2 rise to the atmosphere. And then CO2, the sun, and plants continue photosynthesis. The system keeps running like that as usual.
