From ‘biologically dead’ to chart-toppingly clean: how the Thames made an extraordinary recovery over 60 years
From ‘biologically dead’ to chart-toppingly clean: how the Thames made an extraordinary recovery over 60 years: The Thames is one of the world's cleanest city rivers. JPLenio/Pixabay 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 …