How is energy produced?

Energy is produced or generated from natural resources, which are usually called energy sources.
The examples of energy sources are coal, gas, oil, water, sun and wind.

Not all energy sources are the same. Some of them can be dangerous for the environment we live in. For example, when oil or gas is burnt in order to produce energy or to heat the houses, a lot of harmful things are released into the air making it bad for breathing. We have already used so much of the coal, oil and gas, which was stored on our planet that only a small amount of those resources remain at our disposal.

In the light of this many people have decided to find other sources of energy, which would not harm the air and the amount of which would never end. Such types of energy sources are called alternative energy. Examples of alternative energy sources are solar energy, wind energy, geothermal energy and biofuel energy. All of these sources give us “clean” energy, because it is safer for people and for the environment we live in.