The 'fossil fuel' group
These nouns refer to different kinds of fuel.
crude crude oil diesel fossil fuel fuel oil solid fuel
A switch away from fossil fuel across the world could reduce carbon dioxide emissions by between 25 and 50 per cent.
The price of a fossil fuel can go up quite a lot if demand grows faster than supply.
Fossil fuels, such as coal, oil, gas, and minerals are examples of nonrenewable resources.