Folks at Cognitive Edge have some interesting presentation slides on the topic of complexity in dynamic systems. I think they may be helpful as teaching tools.
If you decide to read these keep in mind one point: humans are already operating within a system that is far from balance (the natural system). Any man-designed system built with a goal to stage a far-from-balance dynamic will be compounding the existing natural imbalance. As a result, this will add unnecessary complexity (obstacles) for human potential and human success. This is my opinion and perspective, all I ask is that you keep it in mind.