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

1.
paliwo kopalne
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.
Spalanie paliw kopalnych uwalnia dwutlenek węgla do atmosfery.
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Many countries are trying to reduce their reliance on fossil fuels.
Wiele krajów próbuje zmniejszyć swoje uzależnienie od paliw kopalnych.