(Editor’s note: This post by Marine Corps Times staff writer Gina Harkins first appeared on that publication’s Battle Rattle blog.) New sea lanes are opening around the the North Pole due to melting ice, and the Navy and Marine Corps are ready to defend them if needed. Chief of Naval Operations Adm. Jon Greenert met with Navy Times reporters and editors in late February to discuss where the service is headed. One of the places he highlighted might not be on the minds of sailors and Marines, but with more ships likely to use new routes opening in coming years,…