fossil fuel
US /ˈfɑː.səl ˌfjuː.əl/
UK /ˈfɑː.səl ˌfjuː.əl/

1.
combustibile fossile
a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms.
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Burning fossil fuels releases carbon dioxide into the atmosphere.
La combustione dei combustibili fossili rilascia anidride carbonica nell'atmosfera.
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Many countries are trying to reduce their reliance on fossil fuels.
Molti paesi stanno cercando di ridurre la loro dipendenza dai combustibili fossili.