A multinational coalition launches Project Thermostat?stratospheric aerosol injection to rapidly cool the planet and prevent climate tipping points. For six months, it works. Then the unintended consequences hit: the Asian monsoon fails, catastrophic weather disruptions cascade globally, and political pressure forces an abrupt termination of the program. The result is "termination shock"?a year of compressed climate change that applies 50+ years of warming in twelve months, hammering an already-stressed planetary system and triggering compound disasters across every interconnected network humanity depends on.