grand solar minimum:
a period during which solar activity diminishes, resulting in drastic climatic and geophysical changes to our planet. These include increased galactic cosmic rays (GCRs), seismic activity, and volcanism; the latter often results in a global reduction in temperatures (see "the year without a summer" -- and much more on the IAF wiki).
(1) a system that not only endures in but benefits from external chaos
Taking steps daily towards radically self-sufficient communities.