Similar to Russian oil industry, farmers in Libya (which is right in the middle of Sahara) use vast areas of the planet to survive in the tropical climate.
These circles that brought many discussions in Google Earth community are huge 500 meter in diameter agriculture fields that use groundwater for irrigation.
According to NASA, the green circles serve as a good landmark for austronauts on the ISS.
Libya agriculture project in Google Maps
Wednesday, April 16, 2008
Libya circles
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