 Climate change is projected to cause significant changes in river flow regimes around the world, which could have serious implications for freshwater ecosystems. These changes include decreased low flows, increased high flows, and delayed peak flows. Additionally, climate change is expected to exacerbate existing flow alterations caused by human activities such as dams and water withdrawals. This means that climate change could lead to further degradation of freshwater ecosystems if appropriate measures are not taken to mitigate its effects. This article was authored by P. Dahl and J. Zhang.