Endangered US rivers at grave risk from dams, mining and global heating

New report lays out dire situation facing the most imperiled rivers but environmental activists say situation is salvable

Dams, mining, factory farms and global heating are among the gravest threats facing America's endangered rivers, according to a new report.

The Snake River in the Pacific north-west is ranked the most endangered US river of 2021, where salmon runs are on the brink of extinction because of four federal dams obstructing the free flow of water, according to American Rivers' annual report.