- Mega-Volcanic or Seismic Event
- Global Pandemic
- Abrupt Climate Change, including from a Methane Catastrophe (runaway feedback between global warming and release of methane deposits), or Thermo-Haline Disturbance (reversal of the Atlantic ocean current, and cooling of Europe)
- Globalized Economic Collapse
- Revolution in the Supply of Energy
- Collapse of Fish Stocks
- The Collapse of Africa or China
- Development of Genetic Treatments to Prevent the Effects of Aging, and conflict between New and Old Humans (emergence of gap between the enhanced/non-enhanced)
- The global proletarianized middle classes, or resentful youth burdened with growing Baby Boomer retiree dependents, becoming a base for revolutionary organizations
- Terrorist Coalition of the Willing
- Catastrophic Space System Damage (such as from solar flares)
- Broadcasts to the Brain (through networked brain chips)
- The development or use of new weapons, such as electromagnetic pulses and neutron weapons
http://crnano.typepad.com
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