Humans have a habit of destroying things - and themselves

Every summer, visitors to Yellowstone National Park in the United States rush to the famous geysers, the boiling mudpots and spectacular waterfalls. Everyone hopes to encounter some large, dangerous animals up close - bears, elk, moose and bison.

In September, my wife and I joined them. And we were not disappointed. The wildlife in its wild natural habitat is unforgettable.

But it's the bison (most people call them buffalo) that always get me to thinking more deeply about human irresponsibility.