It began as a quest for knowledge and understanding of the issues surrounding the controversial Enbridge 'Line 5' that runs through the Straits of Mackinac. With the release of the 2nd part of his documentary on the subject, Ann Arbor's Barton Bund contends that a cause for concern has become a need for alarm. In this week's "Issues of the Environment," Bund discusses 'Line 5-Part 2: Violation of Public Trust."