fossil fuel
noun /ˈfɒsl fjuːəl/
  /ˈfɑːsl fjuːəl/
 [countable, uncountable]- fuel such as coal or oil, that was formed over millions of years from the parts of dead animals or plants- Carbon dioxide is produced in huge amounts when fossil fuels are burned.
- Fossil fuel reserves are rapidly being depleted.
- Gas is the only fossil fuel without environmental problems.
 WordfinderTopics The environmentb2- energy
- fossil fuel
- fracking
- fuel
- hydroelectric
- nuclear
- oil
- power station
- solar
- wind farm