Warming Raises Life-Or-Death Questions on Island Once a Wolf's Paradise

"Although they rarely come into contact with humans, eight gray wolves on an island in Lake Superior are causing a big headache for the National Park Service."

"Rising winter temperatures have nearly obliterated the infrequent occurrence of an ice bridge that forms between Michigan's Isle Royale National Park and the mainland, the only way wolves naturally arrive there. Today, the shrinking wolf pack is so inbred that some fear they will no longer reproduce.

But others say that climate change has not played a role in the wolves' decline, claiming that despite their isolation, the pack could recover and carry on."

Elizabeth Harball reports for ClimateWire December 3, 2013.