If no one has been attacked, how do you know that the “bear bangers” work?
For us in southern country, perhaps you could explain what a “bear banger” is.
The term would bring to mind a large caliber handgun in the United States.
Basically, a 'banger' is similar to a shotgun shell, but has no shot, only a small plastic cap. You place it on a 'pen' launcher, aim it up directly over your head, and pull the trigger. It fires into the air making a loud 'bang', like a shotgun blast, which scares the bear away.
The downside is, in a panic, if someone aims it towards the bear and fires, and it overshoots the bear, you have a scared, angry bear running away from the sound TOWARDS you!
Here is a link to a "Bear Banger" from Mountain Equipment Company in Calgary.