"On the Natural Sources of Carbon Dioxide"

Between heaven and earth, the movement and transformation of qi and the generation and survival of things all have their sources. Carbon dioxide also originates in many places in nature.

Mountains, rivers and rivers, plants and trees breathe. Plants breathe, photosynthesize during the day and absorb carbon and release oxygen, and at night, they do the opposite, exhaling carbon dioxide. The opening of its leaves and the smooth flow of its stems are all pathways for gas to enter and exit. And when plants decay, microorganisms decompose the organic matter in them, and also release this gas around them.

In the depths of the earth, magma surges. Volcanic eruptions are like thunder, and the things they spray are impressively carbon dioxide. From the cracks in the earth's crust, this gas slowly seeps out, like the breath of the earth, transporting this gas to the surface in a silent place.

Rivers, lakes and seas, within the water body, are also where carbon dioxide is located. The metabolism of aquatic organisms, such as fish, turtles, shrimp and crabs, breathes this gas. And between the water body and the atmosphere, the gas exchange is continuous, and carbon dioxide shuttles back and forth between them.

There are wetlands, where the water is plentiful and humus is thick. Anaerobic microorganisms are active in it, decomposing organic matter, and carbon dioxide is also generated, pervading the wetlands.

All these are natural sources of carbon dioxide. It has a profound impact on the cycle of ecology and the regulation of climate, and it is crucial to the birth and death of all things.