The related ancient articles with carbon-based energy as the core explain
There are all kinds of energy between heaven and earth, and carbon-based energy is of great importance. Although ancient times did not have the detailed title of today, it was widely used.

Watching the past, firewood is the most common carbon-based energy. What is produced in the mountains and forests, the people take it for cooking and keeping out the cold. Every autumn and winter, the chill gradually thickens, and the people cut the salary for the woodwork and pile it up on the side of the house. At night, when it is burned indoors, the fire is bright and extinguished, and the warmth overflows. The power of this firewood comes from grass and trees, and the growth of grass and trees depends on the nourishment of heaven and earth, absorbs carbon and absorbs the sun, and after years, accumulates energy.

There are also coal people, hidden deep in the ground. The people of ancient times have gradually noticed. Its quality is black and heavy, and when it burns, the fire is raging, and the heat effect is quite good. Or used for smelting iron castings, or for heating workshops. The craftsman put coal in the furnace, and the blast supported the combustion. The iron stone was melted into liquid through its high temperature, and then cast into a tool, which was used by the world. Coal came out of the ground, dug in the abdomen, and after hundreds of millions of years of creation, it became this carbon-based rich ore.

Furthermore, oil is also a kind of carbon-based. Although it was not widely used in ancient times, it was also felt. Its liquid is sticky and born in the underground rock strata. Or it seeps out from the ground crevices and floats on the water surface. It is black in color and smells different. The ancients occasionally obtained it, or used it for fire attacks, and when it burned, the flames would soar into the air, with amazing power. These are all carbon-based energy sources that operate in the world and are used by people. They are indispensable for people's livelihood.