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Illustrating what scientists have learned from the disaster 20 years ago.

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The beauty of the blue ice belies a fragility exposed by human activity
The blast scrubbed some of its own methane emissions from the atmosphere
How jellyfish in bycatch yield collagen for skin care, drug capsules, and nutritional supplements
Critically endangered pilot whales struggle to communicate over the din of boats
A conversation with an ecologist and a national security expert about the underappreciated risks posed by ecological disruption
Peter Raven, the transformative conservationist and father of “coevolution,” passed away this week