ABSTRACT
Fossilfuelsincludeoil,coal,andnaturalgas.Renewableenergyresourcesincludehydropower, wind,solar,hydrogen,biomass,tidal,andgeothermal.Alltheseresourcescanalsobeclassi›edas primary and secondary resources. The primary resources are
1. Fossil fuel 2.Nuclear fuel 3.Hydropower
Thesecondaryresourcesincludeallrenewableenergyminushydropower.Over99%ofallelectric energy worldwide is generated from the primary resources. The secondary resources, although increasing rapidly, have not yet achieved a level comparable to the primary resources.
