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Alex Honnold just led the first ascent of one of Earth's tallest Arctic sea cliffs—for science
Battling treacherous conditions, celebrated rock climbers help a scientist traverse a remote Greenland ice cap, gathering crucial climate data along the way.
Alex Honnold leads a pitch during the first ascent of a sea cliff in eastern Greenland known as Ingmikortilaq, which in Greenlandic means "the separate one."
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