In summary, both climate change and human activities influence the magnitude and direction of change in runoff and streamflow. There are no clear trends of changing streamflow on the global level. However, trends emerge on a regional level  . Climatic factors contribute to these trends in most basins . They are more important than direct human influence in a larger share of major global basins , although direct human influence dominates in some . Overall, anthropogenic climate change is attributed as a driver to the global pattern of change in streamflow .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report