Between heaven and earth, the carbon in the atmosphere comes from many sources. Mountains, rivers and seas are all involved. In the forest, the leaves breathe, and between the air, carbon enters the atmosphere. Rivers are rushing, carrying carbon and flowing, and after chemical transformation, it is also a carbon source. And the hidden underground, kerosene and gas, are mined and burned, and carbon is discharged into the air. What people do, farming and animal husbandry, and the development of civil engineering, all make carbon come out and accumulate in the atmosphere. The four things interact, resulting in the gradual accumulation of carbon in the atmosphere. Examining its source, we can see that natural people and carbon in the atmosphere all play a role. We should study it in detail to understand it, and plan for future generations for a long time.