Investigate the surface of your home town.
Walk through a quarter of your town and use a town map for orientation.
How much of the surface is covered with streets, buildings, or concrete?
Are there green areas and how extensive are they?
Make a black and white copy of your town map and paint the green areas and the non built up areas in green color, then the built up area in red.
Your final task is to calculate (measure) how much of the natural surface (in percent) still exists in your home town.
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