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Food was scarce because the moon covered the sun so agriculture was not common plus the weather was really bad such as blizzards and hurricanes so the road was damaged by trees and was blocked by snow so trips to the supermarket was difficult. Also, right when the moon got hit by an asteroid, people started panicking so they took all the food and clothes so there would be no food and other materials left.
Why was food so scarce after the moon came closer into orbit?