We're probably going to see more of this gender: the post-climate change dystopia. There was already Bacigalupi's Water Knife and others. This novel (not really sci-fi) takes its place squarely within that genre. In the post-climate disaster, The Change, era, England has built a Wall around itself to protect itself from The Others, the environmental refugees from other parts of the world, now underwater or uninhabitable. Young men and women now have to serve time on the Wall, as military service, for two years, to try and prevent the Others from getting through. If the Others succeed, they are offered a choice between euthanasia or becoming Help, that is, slavery. And the Wall Defenders who failed to stop them are put to sea, with close to zero chance of survival. As such, this system has created major generational hostility between the generations that did nothing to stop climate change and are still around, and the younger generations who have to live with the consequences, the loss of food diversity, the loss of beaches, and then, of course, the Wall.
The novel follows one such young man as he starts his Wall service.
This is rather bleak, with limited hope. Nevertheless, it is a page-turner, and clearly meant as a warning of things to come.