Unpredictable

 One day it's sunny and your playing sports outside
One day It's raining and your inside on your game
 Next day It's a blizzard and -34° out
Next day It's a massive heat wave 96°
After a year The yellow stone valcono erupts
After a year it's an ice age again
After a decade modern life is back
After a decade more technology is out
After a Century your dead
After a Century everyone's dead