How about utilizing the space under "your" bedroom windows yourself!
Would a cactus look good there? Maybe a beautiful thorny rosebush? A tree? Rock garden?
You can't be heard when people won't listen. Their oblivion is now your headache.
It's time (to my way of thinking) to occupy your own space!
Have you ever asked them why? I imagine you can't do anything about trash cans on your property line, but it they put it in front of my house I would take it to their front door. That's just me.... more