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Preserving mankind's food source in the Arctic tundra

On an island about halfway between Oslo and the North Pole is the Svalbard Global Seed Vault, an international effort to safeguard the sources of the world's food supply. The complex, built underneath the Arctic tundra, holds more than half a billion seeds, and is known as the "Doomsday Vault," protecting mankind's food supply against natural catastrophes. Seth Doane reports from Svalbard, Norway, and discovers an Iowa family whose heirloom seeds are also preserved there.
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