The type of energy generated from fossil fuels is called chemical energy. Fossil fuels, including coal, oil, and natural gas, are composed of organic materials that have undergone millions of years of heat and pressure, transforming them into energy-rich deposits. When these fuels are burned, the stored chemical energy is released as heat and converted into other forms of energy, such as mechanical energy for electricity generation or transportation. Although fossil fuels are a major source of energy globally, their combustion also contributes to air pollution and greenhouse gas emissions, leading to environmental concerns.