Fossil fuels are non-renewable energy resources. Their supply is limited and they will eventually run out.
Coal and oil release sulphur dioxide gas when they burn, which causes breathing problems for living creatures and contributes to acid rain.
Fossil fuels release carbon dioxide when they burn, which adds to the greenhouse effect and increases global warming. Of the three fossil fuels, for a given amount of energy released, coal produces the most carbon dioxide and natural gas produces the least.
A non-renewable energy resource is one that has a finite supply and it will run out at some stage. They are used faster than they can be replaced.
Fossil fuels such as oil, natural gas and coal are considered non-renewable because they cannot be replaced within a human lifetime.
Carbon capture and storage is a way to prevent carbon dioxide building up in the atmosphere.
It is a rapidly evolving technology that involves separating carbon dioxide from waste gases.
The carbon dioxide is then stored underground, for example in old oil or gas fields such as those found under the North Sea.