JUNEAU, Alaska – Alaska is known for pioneering, self-reliant residents who are accustomed to remote locations and harsh weather. Despite that, Gov. Sean Parnell worries a major earthquake or volcanic eruption could leave the state's 720,000 residents stranded and cut off from food and supply lines. His answer: Build giant warehouses full of emergency food and supplies, just in case.

For some in the lower 48, it may seem like an extreme step. But Parnell says this is just Alaska.

In many ways, the state is no different than the rest of America. Most people buy their groceries at stores, and rely on a central grid for power and heat. But, unlike the rest of the lower 48, help isn't a few miles away. When a fall storm cut off Nome from its final fuel supply last winter, a Russian tanker spent weeks breaking through thick ice to reach the remote town.