With problems of declining stocks of fossil fuels and long term problems of nuclear energy, many countries are developing cleaner fuels which only need simple technology.

Suggested activities and experiences to select from:

Design a biogas digester; Research use of biogas in cities such as Newcastle and Leeds.

Assessable learning outcomes:

Foundation Tier only: State that biogas is used in certain remote parts of the world lacking a mains electricity supply or mains sewage system. Describe the dangers of methane being released from landfill sites (it can burn or explode preventing use of the site for many years).