On the other hand, here's an interesting take on the G-20 protests from Pittsburgh labor historian Charles McCollester. He recalls earlier protests in the city that descended into violence. And he describes the varied reactions of residents to today's demonstrators.
McCollester also argues that the Pittsburgh leadership doesn't want green manufacturing because it doesn't want manufacturing, period. It wants to continue to be "green" more through an absence--of industry and a troublesome working class--than through starting anything new.