Polar bears are wild creatures. They roam widely, with some having been tracked to a home range of over 6.000,000 square km. One individual was found more than 4000km from where it was before.
Its not even an issue of just giving them a large reserve, as they spend the cold winters roaming far and wide across the worlds oceans. Even in a country like Canada or Greenland, it is not possible to exclude humans from that much land.
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