“Why do you keep just picking up the rubbish?”
Because I love it. Because it needs to be done. Put them in whatever order, same same to me.
And, because for every hundred people who see me pick up the rubbish, 5 people say they appreciate it. And one will stop to help.
That one, may turn out to be a lifelong crewmate, who then goes and picks up rubbish when they see it, just because. And people see that. And sooner or later, someone will stop and give them a hand.
This is how we change the course of our world for better. By picking up one bit of rubbish at a time.