Salmon are legendary for their commitment to procreation. You know the drill: They wander the ocean before returning to rivers where they hatched, fire themselves upstream to spawn, and then drop dead. It’s not such a rigid life cycle, though. In fact, it’s a system that’s allowed a species like the chum salmon to find new habitats: Some individuals actually seek out different rivers and spawn there. Now, scientists say, chum salmon are spawning in the Arctic, a sign of rapid climate change.
As the Arctic warms up to four times faster than the rest of the planet, species are migrating to higher latitudes, both because the Arctic is becoming
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