Beginning of Essay
The beginning of the (chlorofluorocarbons) era started in 1928, when ' were invented by a Du Pont chemist. ' were best known as "freons" and became famous as a safe, nonflammable refrigerant. It's invention became a great triumph when Freon took the place of sulfu ....

Middle of Essay
.... from the sun. This radiation is the one which would not reach the lower atmosphere in large amounts because of the ozone layer. When these s do brake down, they released atomic chlorine which then would react with the ozone and convert it back into plain oxygen. The even worse part of all this is that these chlorine molecules do not become inactive after the first reaction with the ozone and would be available to destroy more ozone molecules. Thus this process would be the function of a catalyst; a single chlorine atom involved in a chain reaction to destroy many ozone molecules. Rowland and Molina eventually agreed that this thinning of the ozone s ....