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The project, led by UAF researcher Katey Walter Anthony, studied lakes in Alaska, Canada, Sweden and Siberia where permafrost thaw surrounding lakes led to lake shoreline expansion during the past 60 years.

Using historical aerial photo analysis, soil and methane sampling, and radiocarbon dating, the project quantified for the first time the strength of the present-day permafrost carbon feedback to climate warming.

[Image Gallery: Stunning Mammoth Unearthed] The research team found the tusk in soil deposits about 5 feet (1.5 meters) underground.

Though other sites have ivory fragments, this discovery marks only the second time that researchers have uncovered an entire mammoth tusk from an archaeological site in Alaska, the researchers said.

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