Redundant Redundancy

... the Norwegian government is planning to create the seed bank next year at the behest of crop scientists. The $3 million vault will be built deep inside a sandstone mountain lined with permafrost on the Norwegian Arctic island of Spitsbergen. The vault will have metre-thick walls of reinforced concrete and will be protected behind two airlocks and high-security blast-proof doors. It will not be permanently manned, but "the mountains are patrolled by polar bears", says Fowler. New Scientist

They are going to dig a hole in a cold place and bury a bunch of seeds for future generations. If the environment changes people will have a bunch of seeds to start over. If the environment changes will the seeds work? I am all for backups,  You have to have a plan for restoring too.