The Polystyrene Packaging Council Website seems to be saying that styrofoam isn't the evil bringer of doom that people think it is. Here's a page of fun facts about styrofoam, including the following:

All polystyrene packaging comprises only a tiny fraction of the material that goes into our landfills. In fact, less than one percent by weight of the total municipal solid waste disposed is polystyrene. Paper and paperboard products make up the largest category of material (about 31 percent) disposed in our landfills.

and

No chlorofluorocarbons (CFCs) are used in the manufacture of any polystyrene foam packaging products in the United States and have not been since 1990.