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Melting permafrost caused by climate change is causing changes in the northern landscape on a scale not seen since the end of the last ice age. Some time in the future, a small Canadian lake will burst through the shrinking earthen rampart holding it back and fall off a cliff. The lake happens to be perched about 600 feet above the Mackenzie Valley. It will be spectacular, but it won't be unique. [Source: National Post (Canada)]
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