How will life for Humans end on planet Earth?

 
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When Earth is no longer sustainable.....

no matter what happens there will always be survivors somehow but once the Earth is devoured by the Sun or the Sun no longer exists survival on Earth will no longer happen.....
 
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Either a very big comet or life becoming unsustainable due to some combination of environmental changes, overpopulation, resource depletion, etc.

We will be long gone by the time there's a major issue with the Sun aiding life. The question is whether we're gone as in wiped out or gone as in managed to travel to another star system. Odds are it will be wiped out.
 
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