Settled: New paper predicts Alaskan Arctic will either be strong carbon source, strong carbon sink, or carbon neutral
'The magnitude and sign of the future carbon balance of the Arctic are highly uncertain...some models showing Alaska as a strong carbon sink, others as a strong carbon source, while still others as carbon neutral.'
http://www.biogeosciences.net/11/4271/2014/bg-11-4271-2014.html