What changedResearchers warn that marine heatwaves can harm human health and well-being, contributing to anxiety, grief, and depression in coastal communities.Current stateMarine heatwaves are emerging as a threat to human health, in addition to coral reefs and fisheries. Unusually hot oceans can fuel stronger storms, trigger harmful algal blooms, reduce seafood supplies, and disrupt livelihoods.Why it mattersCoastal communities are at risk of experiencing anxiety, grief, and depression due to the impacts of marine heatwaves on their livelihoods and environment.