The basic energy of all human activities comes from the sun. Solar energy can be transformed and stored through the photosynthesis of plants.
Firewood
Firewood is the earliest source of energy used by humans to become a source of heating through combustion. It is important to burn wood and to provide heat, which allows people to survive in cold conditions.
Animal traction
In addition to transporting goods, traditional farm animals such as cattle, horses and donkeys can also pull and push some machinery to generate energy. These energy sources that animals pull are derived from their food. The energy source for these foods is that plants are converted from solar energy through photosynthesis.
Hydraulic
Water mill is a good example of the use of water, and hydropower is a modern and important energy source, especially in countries with rivers like China. In addition, China has a long coastline and is also suitable for tidal power generation.
Wind power
China is the earliest country to use wind energy. As early as 2,000 years ago, wind-driven sailboats were already used in rivers. In the Ming Dynasty, wind turbines were used to irrigate farmland, and wind turbines for agricultural products processing appeared. The main way to use wind energy in modern times is wind power.
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