http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/interdependence/environmentalchangerev2.shtml

https://en.wikipedia.org/wiki/Box_Hill,_Surrey

Look at the pieces on environmental indicators. Explain how lichen can indicate the health of an environment and show how the distance from a road should have an effect on the colour of lichen.

Now plan a campaign to improve the atmosphere in the countryside. How will you prove it is working?

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