That's what was amazing thing about this situation. If you asked someone if they cared about trees, most people would say, “Yes. Of course.” If you asked them after the fact if it bothered them to throw away unused napkins or paper towels, most people would, if they were being honest, would say, “Yes. Of course.”
So what if you could gently remind people that resources like napkins and paper towels are not “free”, so they would stop and think for a beat about how many they were taking and maybe just take a few less? What if it was just a subtle nudge that said “hey there, we’re not judging you, but we just wanted to remind you that these come from trees, and we know you like trees, so do you really want to take that many?”