These are energyEnergy is the ability to do work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. Units of Energy: The SI unit... More sources that do not pollute the environment when they are being used e.g. solar energy, wind energy, waves and hydropower. Electricity consumed in our various houses does not pollute the environment, they are said to be friendly.
On the other hand, energy sources that pollute the environment when used are said to be hazardous to the environment as a result of smoke and gases released to the environment.
Burning fossil of fuel, wood, release large amount of Carbon dioxide (Co2)and Nitrogen dioxide (No2) gases which are dangerous to the environment.
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