Background Paragraph: Beginning in the late 1970’s, ozone depletion was recognized as a significant environmental issue. The most dramatic decrease in ozone occurs seasonally over the continent of Antarctica. The size and duration of the ozone hole steadily increased, with the largest hole recorded in 2006. Fortunately, most countries have recognized the danger of CFCs and dramatically curtailed their use in recent years. It is hoped that ozone depletion will slow and that the ozone layer may eventually be restored to its earlier levels. 
Story: Greg has been on an environmental awareness kick lately. He is trying to buy products that are good for the environment. While at the store, he stopped to look at some hair sprays. The Revlon brand he noticed has CFCs. The Sephora brand he noticed explicitly noted that it did not contain CFCs.
Which brand of hair spray will most likely cause a depletion of the ozone? Which hair spray brand should Greg avoid because it may do harm to the environment? Which hair spray brand should Greg buy to be environmentally friendly? Will Revlon brand be more or less environmentally friendly than Sephora brand hair spray? Will Sephora brand be more or less environmentally friendly than Revlon brand hair spray?