Answer :

There are basically two types of energy sources- renewable resources and non renewable resources. Renewable are those which can be replanished by nature as soon as they are utilized whereas non renewable are those which are not replanished by nature or takes a lot of time.Renewable resources can be used as much required but non renewable are those which should be used judiciously or they will be no more left for the future generation to use.We can, inspite of using renewable resouces, can also use alternative sources such as wind and solar energy. 
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