Watch "Grizzly Man." It's out on DVD and has been on Discovery Channel. The whole Treadwell story is there in his own footage and footage shot after the fact, including interviews with everyone involved.
What a nut. The guy was an absolute loon. Walter Herzog, the filmmaker, had it right when he said Treadwell thought he was out there with human beings in bear suits. If you want to see environmentalism at its loony worst, watch the film. For goodness sake, one sequence shows Treadwell going absolutely gaga over a warm pile of bear manure as he practically worships it in amazement that it was inside one of his favorite bears moments before.
This was a guy who thought taking firearms or bear spray into bear country was an insult to the bears. As he put it, "How could I tell these bears I love them with a can of mace in my pocket?" LIKE A BEAR WOULD KNOW AND CARE. The sad thing was that as he was being mauled he was yelling at Amy to hit the bear with a frying pan. Both might still be alive if they'd had a can of bear spray.