Philip J. Wylie's penultimate work

Philip J. Wylie was a popular novelist whose books appeared throughout the 1930s to 1971. He wrote regular fiction, thrillers, science fiction, and social commentaries. He's best known for the classic end-of-the-world tale, WHEN WORLDS COLLIDE and its sequel AFTER WORLDS COLLIDE. Inarguably his most important work was GLADIATOR, the novel that inspired Superman's creation and thus is the root for the entire world of superhero comics and related media that we know them today.
He was nearing the end of his life when he wrote the screenplay LA 2017 and the novel LOS ANGELES AD 2017. It reflected his concern over the rise of pollution over his lifetime and his worry for the future. He passed away the autumn after LA 2017 aired. The novel came out that summer.
His final work was the posthumous THE END OF THE DREAM, another tale of ecological collapse.
If you've never read anything by Wylie, you owe yourself a trip to the nearest used bookshop or city library.