1

Uncontrollable biological by-product of life support

2

Tectonic instability provoked by recent construction

3

Irreplaceable pretech life support is breaking down

4

Solar flares herald a life-scouring eruption

5

Self-replicating warbots are running amok

6

An innovative tech is catalyzing unexpected ruin

7

Blood-crazed and suicidal ideological sect

8

Unplanned activation of a military doomsday weapon