The tenting section of the Lake Louise campground in Banff National Park now has an electric fence surrounding it. The decision to try such a fence was made after repeated people/bear encounters that did not go well.
Many visitors to national parks (in both Canada and America) don't take the "Don't Feed The Wildlife" signs seriously. Some mean well, thinking the bears or other wildlife must be starving. Others feed wildlife to get close enough to get a photograph. But most just don't think about it. People feed wildlife directly and even indirectly, by leaving a dirty campsite with coolers, stoves, and dirty dishes strewn about. The odors attract the bears, who tear into the coolers or eat food scraps or anything with a smell, including toothpaste and other toiletries. Bears are incredibly smart. Even if the cooler is empty, through experience they know it's a food storage device and will tear into it anyway.

This habituation of wildlife has many bad consequences. Human food is disastrously unhealthy for wildlife, and can weaken their systems, leading to malnutrition and death. Bears get used to being around humans. They get hit on the road after being repeatedly fed out of car windows. And when they start seeing humans as a food source, that is when dangerous encounters happen. People get too close to the bears, the bears get agitated, and people (and bears) get hurt. Bears who repeatedly return to human-populated areas searching for food and garbage become "problem bears," and are relocated. If they keep coming back, the bears are killed.

So people who think they are doing the bear (or other wildlife) a favor, couldn't be more wrong. The park service has a saying: "A fed bear is a dead bear."

To cut down on these incidents, Parks Canada constructed an electrical fence around the tenting section of the Lake Louise Campground. Humans can pass through pedestrian gates, but they are hoping it will keep bears out, and thus protect them from humans who are inadvertently destroying them.