Three Sources of Atmospheric Carbon Dioxide
Between heaven and earth, all things metamorphose, and the composition of the atmosphere is closely related to living things. Among them, carbon dioxide, although accounting for a small proportion, has a profound impact on ecological and climate. The three main sources of atmospheric carbon dioxide mentioned above.

One is biological respiration. All creatures in the world, whether humans, animals, birds, or insects, need to breathe to survive. Inhale oxygen and exhale carbon dioxide. During the day, plants perform photosynthesis, sequester carbon and release oxygen; at night, they also breathe and release carbon dioxide. Mountains, forests, rivers, and rivers, thousands of organisms, breathe day and night, which is one of the sources of atmospheric carbon dioxide.

Second, fuel combustion. Since the evolution of human civilization, fire has been used to cook food, heat and drive equipment. Fuels such as firewood, coal, oil, and natural gas contain carbon. When burned, carbon combines with oxygen to generate carbon dioxide and discharge it into the atmosphere. In ancient times, campfires smoked, but today's factories, fuel and gas, day and night, causing carbon dioxide emissions to increase day by day.

Third, land use change. Mountains and forests were cut down into cultivated land, and wetlands dried up into flat land, causing great ecological changes. Vegetation was destroyed, and the ability to sequester carbon was sharply reduced; soil was turned over, microbial activities changed, accelerating the decomposition of organic matter, and carbon dioxide escaped into the atmosphere. In the past, green fields were flat, but today there are many tall buildings. As the land changes, the source of carbon dioxide also changes.

The source of atmospheric carbon dioxide is related to ecological balance and climate change. People should be reasonable, save fuel, and protect vegetation to maintain a clear atmosphere and ecological stability.