A near extinction level event strikes the earth, humanity is devastated and left with just a handful of hardy survivors. How will a small group of survivors not just survive but how can they rebuild modern civilization from the ashes? Lewis Dartnell's The Knowledge tries to answer this question and serve as a guidebook for restarting civilization.
The beginning of the book covers how, without routine human intervention, infrastructure quickly begins to rot. Survivors will need to scavenge and scrape to get by. Once able to survive Dartnell describes the processes of rebuilding agriculture