I've had some interesting discussions on just how far back climate change concerns go back in sci-fi. There are famous works as far back to the 1950s from my reading. To be fair, you do have to discount and untangle many of the very wrong and worst parts (especially eugenics) of Malthusianism [1] the further back you go, but environmentalism and anthropogenic climate change (even if the models of the causes were sometimes very wrong) have long been concerns in sci-fi used to provide many, many warnings (of some stuff we see applicable today as more than just fiction, sadly).<p>"Soylent Green" has its Malthusianism to discount as well ("Green" as a solution <i>is</i> eugenics and a warning of "Soylent Green" is one to beware of eugenics as a deeply suspect solution to anthropogenic climate change). (That's still sometimes a message people need to hear today. Eugenics is nearly an anti-solution, but plenty of people still raise the specter of it when climate change gets debated.)<p>[1] <a href="https://en.wikipedia.org/wiki/Malthusianism" rel="nofollow noreferrer">https://en.wikipedia.org/wiki/Malthusianism</a>