The leaders of the TOPto TOP expedition have been sailing around the world for the past 15 years documenting human impacts on the environment and the effects of climate change.The leaders of the TOPto TOP expedition have been sailing around the world for the past 15 years documenting human impacts on the environment and the effects of climate change. Credit: Dario and Sabine Schwörer

Dario Schwörer, a Swiss mountain guide and climatologist, his wife Sabine, and their five children have been sailing around the world for the past 15 years documenting human impacts on the environment and the effects of climate change. But no leg of their ongoing voyage has provided such stark examples of our ever-warming world than the latest, a journey that wouldn’t have been possible just a decade ago: a trip through the Northwest Passage.

This storied route through the Arctic Ocean was, for centuries, thought impassable, because it was entirely locked up in ice. Ships that tried to make the crossing were lost at sea. But now, the ice is melting, opening the North up to exploration and exploitation.

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