I agree with the ban on plastic bag use, there are so many unnecessary plastic bags an average individual use. Banning plastic bags are for the better.
They valued family, I believe.
It is dark because Barnardo has trouble seeing the other guard.
This scene takes place at midnight and it is so dark Barnardo cannot see the other guard. Barnardo shows up for his shift, but he can't clearly make out who Francisco is. Francisco has the same problem because instead of answering Barnardo he tells him to identify himself first. They get it figured out and Barnardo begins his shift.
