Wow! Half of humanity is a pretty large portion. I don't know if it's really to 'mass extinction' levels at that point.
I'd say the easiest way to slice it would be a simple matter of age. The oldest 50 percent of humanity dies, leaving the 50 percent with the most potential time to flourish. While going through on a case by case basis may produce a slightly better list, it would take far too much time in an emergency.
Depends on how many spots are available.
Let's say for example about half of humanity.
Wow! Half of humanity is a pretty large portion. I don't know if it's really to 'mass extinction' levels at that point.
I'd say the easiest way to slice it would be a simple matter of age. The oldest 50 percent of humanity dies, leaving the 50 percent with the most potential time to flourish. While going through on a case by case basis may produce a slightly better list, it would take far too much time in an emergency.