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| And the more they eat, the more food they store as fat for the short summer season when they fast. |
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| This warming of Earth is known as global warming. |
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| When bears eat these seals, they ingest toxins. |
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| ...One inhabitant lives there year round... |
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| This creature of the North is well suited to the inhospitable conditions of the tundra, but in recent years the polar bears living along the northern edge of the tundra have been struggling to survive. |
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| Two layers of fur and a thick layer of body fat insulate polar bears from extremely cold temperatures. |
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| The snow has a chance to melt, and low-growing plants such as mosses, lichens, grasses, and small shrubs grow. |
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| The abundance of insects attracts huge numbers of birds that migrate to the tundra and make it their summer home. |
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| Many people and organizations like Polar Bears International and the World Wildlife Fund are concerned about the plight of the polar bear. |
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| Scientist believe global warming is caused by pollutants that are being released into the atmosphere. |
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| Currently, it is not so much humans hunting the polar bear that poses the greatest threat to its survival. |
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| Their white fur also helps the to blend in with the snow, making it easier fro them to stalk their prey. |
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| But one living thing has managed to thrive in the tundra- that is, until now. |
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| Many pollutants reaching the air and water are toxic. |
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