The Norwegian town hosting the world's "doomsday vault," which was chosen for its consistently cool climate, is facing rising temperatures that could threaten the safety of the vault. The city of Longyearbyen has experienced a temperature increase of 3.7 degrees Celsius over the last century, which is more than triple the global average of around 1 degree Celsius. The vault stores nearly one million copies of the world's seed supply, with seeds from almost every country. Longyearbyen was chosen to hold the seeds because the area isn't prone to volcanoes or earthquakes, and Norway has an "extremely stable" political system. Rising temperatures have begun to melt the permafrost the vault is built on, and the ground surrounding the vault's entrance has failed to refreeze.

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