Tracking Narwhals: An Arctic Journey

The "Nightline" team traveled with Inuit guides on snowmobiles and Komatik sleds. As they journeyed to the Floe Edge, they rode over lakes of melted water atop sea ice floating in the ocean. Cracking sea ice has become a major issue here, not just because it creates hazards but because the animals and indigenous people rely on sea ice to survive. (Eric Coomes)