Final answer:
Man has been using fossil fuels, wind energy, hydroelectric energy, and solar energy as forms of energy over the ages.
Step-by-step explanation:
Throughout history, humans have been using various forms of energy. One of the primary forms of energy that man has been using is fossil fuels. Fossil fuels are derived from ancient organic matter, such as plants and animals, that have been transformed into coal, oil, or natural gas over millions of years.
In addition to fossil fuels, man has also harnessed renewable energy sources such as wind energy and hydroelectric energy. Wind energy is obtained by using wind turbines to convert the kinetic energy of the wind into electrical energy, while hydroelectric energy is generated by harnessing the energy of flowing or falling water to generate electricity.
Furthermore, solar energy has become an increasingly popular form of energy. Solar panels capture sunlight and convert it into electrical energy through the photovoltaic effect. This form of energy is clean, renewable, and abundant.