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The entrance to the underground Svalbard Global Seed Vault juts from a hillside in the Norwegian Arctic. (Credit: John McConnico/Associated Press)

After several years of planning and digging, the world has its first secure, deep-frozen repository for backup supplies of seeds from hundreds of thousands of plant varieties that underpin agriculture.

[url=http://dotearth.blogs.nytimes.com/2008/02/26/buried-seed-vault-opens-in-arctic/#more-176]READ MORE[/url]