Today's episode is bittersweet because we have reached the end of our hike. After three years and 50 episodes, we are wrapping up The Green Tunnel with something a little different. Every episode of The Green Tunnel has focused on some aspect of the history of the Appalachian Trail, but today we're looking forward. What will the AT's future look like? How will the trail evolve? What will the greatest challenges be for the trail we all love?