Terry Pratchett and Neil Gaiman's Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch.

Now white and brown sculptures of foam and sludge drifted serenely down the river, often covering it for yards at a stretch. And where the surface of the water was visible it was covered with a molecules-thin petrochemical sheen.
There was a loud whirring as a couple of geese, thankful to be back in England again after the long, exhausting flight across the Northern Atlantic, landed on the rainbow-slicked water, and sank without a trace.

The Four Horsemen of the Apocalypse -- War, Famine, Pollution (Pestilence retired in the 1930s post-discovery of penicillin), and Death -- are preparing to ride per the Book of Revelation. Pollution's introduction occurs on the banks of the river mentioned above, while the quotation refers to his nearly romantic view of contamination and waste.