London river was declared ‘biologically dead’ in 1957; decades later it is filled with sharks and seals
[ad_1] In 1957, parts of London’s famous River Thames were in such bad shape that scientists declared them ‘biologically dead’. The water had been starved of oxygen and decades of sewage and industrial pollution had made it extremely difficult for aquatic life to survive. About 70 years later, the waters are now brimming with sharks,…