It might surprise you to know that the River Thames is considered one of the world’s cleanest rivers running through a city. What’s even more surprising is that it reached that status just 60 years after being declared “biologically dead” by scientists at London’s Natural History Museum. Yet despite this remarkable recovery, there’s no room for complacency – the Thames still faces new and increasing threats from pollution, plastic and a rising population.
The Thames runs 229 miles from Kemble in Gloucestershire to Southend-on-Sea in Essex, where it flows into the North Sea. Where it bisects London, it has experienced pressure from expanding numbers of city-dwellers since medieval times.
