Doomsday novels usually explored the reactions and actions of humans in the face of crisis, as well as the good and evil and complexity of human nature in such a predicament. In the real world, the destructive behavior of humans has brought a serious burden to the natural ecology, leading to various natural disasters such as climate change, environmental pollution, ecological collapse, and so on. These disasters not only caused direct harm to human beings, but also caused damage to the balance of nature and ecological systems, causing some species to gradually become extinct or on the verge of extinction. In novels, the apocalyptic theme usually depicted such destruction and disaster as a global problem, forcing the protagonist to take action on a global scale to protect the natural ecology and save human civilization in the face of crisis. In this process, the protagonist may encounter various difficulties and challenges, including internal conflicts and external threats. At the same time, he has to face his own moral and religious choices. Doomsday novels often explored the reactions and actions of humans in the face of crisis, as well as the good and evil and complexity of human nature. At the same time, they might also emphasize the importance of protecting the natural ecology and the relationship between humans and nature.