The lost O2

The world suffers from the lack of oxygen, the only way to find it is to use special devices that provide it. It's called liquid air and is contained in special barrels tht produced by one company. Many people strive to survive while a small minority is living in normal conditions, while they can. The world is filled with AI advanced technologies that do the job for people but some of them are created to reduce the population that is at risk to make them suffer less. It has become quite difficult to find any supplies since people abandoned many cities and other major settlements. But there are still survivors that try to. They use those AI advantage technologies to lose track of them and make them of their advantage. Majority of those who live in normal conditions live in packed cities that are provided with oxygen and technologies. Because of the lack of oxygen people who are exposed to outside can see the world that became far too dangerous :radiation exposure, AI seeking human machines and other disturbing things. There is also speculations that AI itself elimantes people bacause they use a lot of energy. Some investigators on this case have been lost but the majority of people cannot know that for sure. Only one group of survivors called "Luddits" try to figure out the truth behind the lack of oxygen and AI's true intentions.