Just how much of the earth's surface is needed for growing food for a world of people?
Slice an apple into fourths.
Set aside three of the fourths, as they represent water on the Earth's surface.
Cut the remaining slice in half.
Set aside one of the halves as uninhabited deserts, swamps and Arctic areas.
Divide the remaining piece into fourths.
Set aside three of the pieces for land that is too rocky, wet, hot, or poor for crop production.
The remaining piece is 1/32nd of the original apple. Peel this section.
The peel represents the thin layer of soil that is available for producing all of the world's food crops.
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