I disagree with your idea of choose 'your goal concept'... but anyways given that you have allowed me to have such a great degree of freedom I would like to have 3 goals atleast:
1.Life must survive
2.Humans must survive
3.Other Species must also survive
Threats to survival:
1.Internal (from activity on the planet e.g Nuclear misadventure)
2.External (from activity outside the planet e.g asteroid)
3.Suicidal or Psycological(due to severe stress we decide to call it off e.g Sarin gas holocaust)