SOURCES OF ENERGY
Exploiting sources of energy disturbs the environment.
Selection of a source depends on factors such as
o Ease of extracting energy from the source.
o Economics of extracting energy from the source.
o Efficiency of the available technology.
o Environmental damage caused by using the source.
Some energy sources are cleaner than others causing very less environmental damage. E.g. Solar energy, CNG.
Some devices like solar cell are pollution-free, but their assembly may cause environmental damage.
o Renewable source: They can be regenerated in nature. E.g. Sun, wind, moving water, biomass, etc.
o Non-renewable source: They cannot be regenerated in nature. E.g. Coal, petroleum, natural gas, etc.
Non-renewable resources are Exhaustible.
o Exhaustible sources: They will get depleted after a few hundred years. E.g. Coal, petroleum, etc.
o Inexhaustible resources: They are unlimited and will not exhaust in future. E.g. Biomass, sun etc.