Positive effects of global warming?

According to a new AP article, global warming is causing ice to melt, opening up new shipping lanes in the Artic. Now Russia, Canada, and the United States are contesting who owns the rights to these newly-restored waterways. According to AP, "The dispute has intensified amid growing evidence that the shrinking polar ice is opening up new shipping lanes and allowing natural resources to be tapped. "

Wait -- I thought they were saying global warming was a bad thing?