For the past couple of months, I've been carrying around a couple of polyethene bags in my backpack and I actually use them instead of taking a new one from shopkeepers. I feel good about this little change, although it also makes me more aware of the fact that every single polyethene bag I use is going to end up in a cow's stomach or clogging some water source or burning and spreading toxic fumes... So I'm going to stitch a few cloth bags for myself :)
It's like a chain reaction. Actions increase awareness leading to more actions. Not bad!