Renewable sources provide energy which is constantly regenerated by means of chemical transformations such as biomass; or physical transformations such as water power, solar, wind power, etc. In particular the sun, the wind, the water cycle, the tides, the heat of the Earth are non-exhaustible sources, which are always available and will never end. Whereas non-renewable sources provide energy through fossil fuels like oil, coal, natural gas, uranium etc. which it takes for millions of years to regenerate these fossil fuels. These sources although there is still plenty of them are limited and represent a sort of energy warehouse on the Earth. This session discusses more about renewable and non-renewable energy.

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