The intensification of lake sediment heatwaves poses significant risks to aquatic ecosystems. Prolonged and frequent heatwaves can disrupt sediment biogeochemical processes, such as methanogenesis and organic carbon mineralization, potentially altering greenhouse gas emissions from lakes. Pelagic regions, which experience delayed heatwave effects, may face prolonged thermal stress, impacting biodiversity and ecosystem stability. Additionally, the study warns of year-round sediment heatwaves in some regions under extreme warming scenarios, which could exacerbate ecological imbalances. These changes may also affect water quality and the overall health of freshwater systems, with cascading effects on human and wildlife populations dependent on these resources.