Meaning & use
fossil fuel
A natural fuel such as coal, oil, or gas formed from the remains of ancient organisms.
See it in a sentence
Many countries are trying to reduce their reliance on fossil fuels for electricity.
Burning fossil fuel releases carbon dioxide that contributes to climate change.
A note on using this word
Fossil fuels are nonrenewable, unlike solar or wind power, because they take millions of years to form.
Words with a similar meaning
coalpetroleum
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
renewable energy
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