One of the comments is right: book or not book, if the global technology regresses too much, humanity is fucked because there are no easily accessible resources

One of the comments is right: book or not book, if the global technology regresses too much, humanity is fucked because there are no easily accessible resources anymore. I'm not sure we can use cities and landfills as sources for metals, and for sure all the easily usable energies sources are gone. (I still laughed at the comment being scared of Marx)