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Marine heatwaves can irreversibly damage ecosystems and, therefore, also present a threat to fishing. Thomas Frölicher (University of Bern), C2SM community members Erich Fischer (IAC/ETH) and C2SM Chair Nicolas Gruber (IBP/ETH) showed in a study just published in the journal Nature that the number of marine heatwaves has increased dramatically in past decades. This trend will further intensify as a result of climate change.