aastatuhandete jooksul maapõue ladestunud ja seal teisenenud põlev orgaaniline aine, nt kivisüsi, põlevkivi, nafta, maagaas ja pruunsüsi, mis liigitatakse taastumatute energiaallikate hulka
a generic term for non-renewable energy sources such as coal, coal products, natural gas, derived gas, crude oil, petroleum products and non-renewable wastes; fossil fuels can be also made by industrial processes from other fossil fuels
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