 Enbridge aims to build a protective tunnel around a four-mile segment at the Straits of Mackinac, which connects Lake Michigan and Lake Huron. Environmental groups and tribal leaders want the state to reverse Enbridge's permit, citing concerns over a potential catastrophic oil spill. The nonprofit group Oil and Water Don't Mix is dedicated to preventing oil spills and promoting clean energy, and they support the appeal. David Holtz, a member of the group, discusses next steps.