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Environment
Environment Main Global Warming Natural Disasters Habitats FRESHWATER

Arctic Circle Ice

The Arctic Ocean's sea ice is in a "death spiral" due to rising temperatures, scientists said in 2008. Many marine species, such as these narwhals swimming through a bay in Nunavut, Canada, depend on the ice throughout their life cycles. Experts predict that summer Arctic ice may completely disappear within a few decades.

Photograph by Paul Nicklen