Depolluting the river Thames

Abstract

Let's travel to somewhere almost near by, I'm sure some of you have actually seen it with your own eyes. I'm talking about the river Thames, which is the longest river in England, with almost three hundred fifty kilometers long...
As a result, you won't find it very surprising if I told you that in 1957, the Thames was so polluted that it was declared biologically dead by the Natural History Museum.