Scientists report that climate change is steadily lowering oxygen levels in rivers across the world. According to a new study cited by multiple outlets, warming temperatures and other climate-related effects reduce the amount of dissolved oxygen that rivers can hold. The research links these declines to changes in river conditions that can occur as the climate warms, leading to less oxygen available for aquatic organisms. The oxygen loss is described as gradual but widespread, affecting river ecosystems globally rather than isolated regions. Lower dissolved oxygen can stress or harm fish and other aquatic life, with potential consequences for biodiversity and food webs in freshwater environments. The findings are presented as a growing warning sign for freshwater ecosystems as climate impacts continue. While the outlets emphasize the risk to aquatic organisms, the reporting is focused on the study’s core conclusion: rivers are losing oxygen on a global scale in ways consistent with climate change.