On the artificial and natural sources of carbon dioxide emissions
Between the world and the world, all things are biochemical, and carbon dioxide emissions are related to the ecological balance. There are two sources: one is man-made, and the other is natural.

The source of man-made emissions
Today's man-made carbon dioxide emissions are the first to push energy consumption. Coal, oil, natural gas, such as fossil fuels, are the main energy sources of the world. When burned, carbon and oxygen are synthesized, and a large amount of carbon dioxide escapes. Watching the rise of industry, factories are numerous, and machines are roaring, all rely on these fuels for power, and the daily carbon dioxide emissions are incalculable.

In the field of transportation, cars, trains, planes, ships, shuttle back and forth, most of their power comes from fossil fuels. Cars speeding on the road, exhaust fumes spewing thin, airplanes flying in the sky, and smoke curling from the tail are all sources of carbon dioxide emissions. And with the rapid progress of urbanization, high-rise buildings have risen, and the energy required for construction projects is huge, which is also an important source of emissions.

In addition, the process of industrial production also emits carbon dioxide. Such as the manufacture of cement, when limestone is calcined, calcium carbonate decomposes and carbon dioxide is released. The metallurgical industry, when metal refining, also emits this gas due to chemical reactions.

Natural sources of carbon dioxide emissions
As for natural carbon dioxide emissions, volcanic activity is one of them. When a volcano erupts, magma, gases, etc. erupt from the ground, and the carbon dioxide content is quite high. Looking at the land of volcanoes, there is a lot of smoke from time to time, which contains carbon dioxide. Although its emissions are not as continuous and extensive as man-made, once they erupt, the emissions are considerable.

Biological respiration is also a common way of natural carbon dioxide emissions. All things in the world need to breathe to survive. Animals inhale oxygen and exhale carbon dioxide; although plants perform photosynthesis, they also breathe at night and emit carbon dioxide. In the vast forests and grasslands, countless creatures exist, and during their respiration, carbon dioxide circulates in the world.

The decomposition of organic matter also produces carbon dioxide. The deciduous leaves of humus in the mountains and forests are decomposed by microorganisms, and the carbon element gradually converts into carbon dioxide and is released into the atmosphere. In lakes and oceans, a large amount of organic matter decomposes, becoming a natural source of carbon dioxide emissions.

In short, carbon dioxide emissions are both man-made and natural sources. Artificial emissions, due to frequent human activities, are increasing; natural emissions, following the laws of nature, are also indispensable. Knowing these two, then we can think about how to maintain the balance of atmospheric composition and protect ecological safety.