The peak of carbon dioxide emissions means that China promises that carbon dioxide emissions will not increase by 2030, and will gradually decrease after reaching the peak; Carbon neutrality means that enterprises, groups or individuals calculate the total amount of greenhouse gas emissions directly or indirectly generated in a certain period of time, and offset their own carbon dioxide emissions through careful afforestation, energy conservation and emission reduction, so as to achieve "zero emission" of carbon dioxide.

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Carbon is a nonmetallic element with chemical symbol C, which is stable at room temperature, difficult to react and extremely low in toxicity to human body. It can even be safely ingested in the form of graphite or activated carbon, which is located in the second periodic group of the periodic table of elements.

Carbon is a very common element, which exists widely in the atmosphere, crust and living things in various forms. Latin is Carbonium, which means "coal, charcoal". Carbon has various structures and can exist in the form of simple substance with various properties, such as crystalline carbon, amorphous carbon and transition carbon.

The understanding and utilization of simple carbon has a long history, and a series of compounds of carbon-organic matter are the basis of life. There are many allotropes of carbon, such as diamond, graphite, graphene and fullerene, which are widely used in aviation, medical care, petrochemical industry, national defense and other fields.

In addition, carbon is one of the components of pig iron, wrought iron and steel. Carbon can chemically combine with itself to form a large number of compounds, which is an important molecule in biology and commerce. Most molecules in organisms contain carbon.

Carbon exists as a free element (diamond, graphite, etc.). ) and compounds (mainly carbonates of calcium, magnesium and other positively charged elements).

It exists in the form of carbon dioxide, which is a small but extremely important component in the atmosphere. It is estimated that the total abundance of carbon in crustal rocks varies greatly, but the typical value can reach180 ppm; ; According to the order of abundance, this element is located at 17, after barium, strontium and sulfur, and before zirconium, vanadium, chlorine and chromium.