What is a key difference between the popular space ship framework and Garrett Hardin lifeboat framework

One key difference between the spaceship framework and that of the lifeboat framework is that by comparing the earth to a spaceship they are saying we must keep all resources for ourselves. Where as in the lifeboat theory Hardin is saying that we must share the resources that we have collected.

D. The spaceship metaphor suggests that humans must share resources to survive; the lifeboat metaphor suggests that some humans must hoard resources.

Just finished APEX. it's freakin hard