Overbreathe by Lucian Arther

No one knew how the seeds had come to rain down from the sky. No one knew how the trees that grew in the aftermath produced such tremendous amounts of oxygen. No one knew how to stop the atmosphere from flooding with O2. And then it was too late...

Talik likes to pretend the apocalypse never happened. For five years, he's hidden away from the world, burying himself in history books and escaping the present. But when he's suddenly saddled with the care of his six-year-old niece, Piya-a task he is wildly unqualified for-hiding is no longer an option. Talik and Piya set their sights on a safe haven and embark on a journey tainted by a hostile climate and mutated predators. If Talik doesn't face his fears in this new world, he'll risk losing the last family he has left.

Ellis has a love for adventure, and she so misses her days of journal photography. She and her old intern, Chance, now use their talents to collect information for the survivors' camp they belong to. Their current target: A government research facility that might miraculously still be running, striving to be humanity's savior. At first, Ellis is excited about the mission, but she soon finds herself lost in a facility of weaponized robots, biological experiments gone wrong, and nonsensical architecture that seems to warp time and space. Will she be able to find the answers she seeks and make it back alive?

A queer sci-fi novel told in two perspectives, Overbreathe is a story about the end of the world, and how we keep going after.