Discuss how corporate greed and stupidity can have a devastating effect on the environment, using Exxon Valdez as an example.
Don't forget greed and stupidity.  It's easy for one company to trash an entire ecosystem.  Exxon Valdez is a perfect example, but there are thousands of others out there.  If we allowed them to, industries like Exxon would trash the planet with 1/10th the population on it.