JOHN BENNETT was for years the Executive Director for Sierra Club in Canada, but has also played key roles at GreenPeace and Friends of the Earth. An articulate advocate and stunt visualizer, he and a journalist famously landed a boat by the nuclear plant near Toronto, tried the back door, which opened, and wandered around for 20 minutes inside before security caught up with them. This was only one PR event he planned in long career as a dedicated environmentalist.