Climate-driven marine heatwaves are causing mass die-offs of marine wildlife including sea stars, fish, and seabirds, representing catastrophic welfare events for billions of individual animals.
Marine heatwave die-offs represent climate-driven welfare disasters of staggering scale. Individual animals experiencing mass starvation events die slowly — emaciated sea lions, starving seabird chicks, and desiccating intertidal invertebrates experience prolonged suffering before death. The scale of individual welfare harm in these events — billions of animals simultaneously — exceeds virtually any other single human-linked welfare harm. Unlike most animal welfare problems, the direct intervention is climate policy rather than husbandry or management change. Marine heatwave welfare makes the animal welfare case for climate action vivid and concrete.