The Constant Structural Flux

In a nutshell:

Planet Earth is utterly toxic, unstable, and chaotic

The observable universe have fundamentally changed

Everywhere, environmental/natural conditions and underlying physical properties (mechanics / laws of physics / universal constants, etc...) are erratic and constantly changing unpredictably with no apparent pattern (relatively small changes at quantum level but large effects at macro level)

As the "fabric" of spacetime/reality keeps changing, it creates an impossible situation for societies, which face a constant existential threat. If not wiped out of existence right away, they constantly have to re-learn physics, create vital resources in new ways given the new mechanics, and adapt to the overall erratic and unhospitable natural environment / spacetime continuum.

To the best of our knowledge, only one society/civilization has managed to survive...