London river declared biologically dead in 1957 now has sharks and seals

The River Thames in London has made a remarkable recovery, evolving from a biologically barren stretch to a vibrant ecosystem full of life, such as sharks and seals. This revitalization is attributed to decades of pollution management and enhanced sewage systems. The Thames Tideway Tunnel plays a crucial role in minimizing sewage discharge. However, challenges like warming waters and nitrate pollution still pose threats.