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The Alaska Highway celebrates its 70th birthday this year. It also faces challenges that could not have been predicted when it was built. By far the biggest is permafrost, the permanently frozen ground that underlies much of the road. As the climate warms, stretches of permafrost are no longer permanent. They are melting - leaving pavement with cracks, turning asphalt into washboard and otherwise threatening the stability of the road. [Source: New York Times]
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