Fossil fuels are the main source of energy in the world today. We use fossil fuels, such as coal, oil and natural gas, to power our cars, heat our homes and generate electricity. However, when fossil fuels are burnt they emit carbon dioxide (CO2), which is one of the greenhouse gases responsible for climate change. Coal, oil and natural gas are also non-renewable, which means that one day supplies could run out. There is therefore a need for renewable, 'clean' energy that does not increase levels of greenhouse gases in the atmosphere.

This section provides more information about the need for renewable clean energy and the role that hydrogen plays in this.