Stories about the environment and the mess we are making of it have been staple in s-f for decades now, with climate change being the current hot topic in that field. Of course, that has now spread beyond just s-f, with horror, fantasy, and even general literary fiction about the climate crisis becoming common. These 14 markets are looking for stories on various aspects of the climate crisis from how we might survive to how our world and societies might change as a result. They range from hopeful (Solarpunk magazine, which is named for a fairly new sub-genre focused on being hopeful and upbeat vs. the rather dark feel of a lot of -punk genres) to rather dark sounding (Club Chicxulub, named for the asteroid that wiped out the non-avian dinosaurs). See if any might be an option for you.
https://authorspublish.com/14-magazines-accepting-climate-and-environmental-fiction/