Second and a Half

http://bigeye.com/911mysteries.htm

… At about the time that the DuPont patent on Freon(TM), the most widely used CFC refrigerant in the world, was expiring the mainstream media picked up on otherwise arcane scientific observations and hypotheses about ozone concentration in the upper atmosphere near the poles. … It turns out that the Dupont replacement refrigerant is, not surprisingly, not as inert as was Freon.
http://peacebytruth.wordpress.com/2010/06/10/some-big-lies-of-science/