'Free Solo' climber Alex Honnold often sees melted glaciers on his climbs. It's changed the course of his career.

'Free Solo' climber Alex Honnold often sees melted glaciers on his climbs. It's changed the course of his career.

National Geographic/Taylor Shaffer

In 2023, world-famous climbers Alex Honnold (of "Free Solo" fame) and Tommy Caldwell tackled the Devils Thumb, a hazardous mountain in southeastern Alaska.

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