- Global warming
- Water problems – too much or too little
- Aquifer depletion and/or contamination
- Ocean acidification – death of sea life
- Ocean warming – death or migration of sea life
- Wind storms – increased hurricanes & tornadoes activity and intensity
- Temperature fluctuations-extreme heat and cold
- Increased volcanic & seismic activity
- Reduced soil moisture
- Crop failure
- Disrupted energy transmission along grids
- Oil shortages
- Mineral depletion
- Over population
- Terrorism
- Chaos and anarchy
- Nuclear war
- Religious war
- Methane air contamination
- Insect plagues
- Drug resistant microbes
- Pandemic disease
- Solar electro-magnetic bursts (flares)