A - C
The benefits of refrigeration, air conditioning, and energy efficient insulation can be provided conveniently and effectively by hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs). These retain many of the properties of CFCs that are desired by users. However, the presence of hydrogen in their structures means that, unlike CFCs, the alternatives are largely removed in the lower atmosphere by natural processes. The environmentally important properties of HCFCs and HFCs were reviewed by the Alternative Fluorocarbons Environmental Acceptability Study (AFEAS) in 1989. Leading experts from around the world evaluated the available scientific information. The experts concluded that the ozone depletion potentials (ODPs) and global warming potentials (GWPs) of HCFCs and HFCs are much smaller than those for the CFCs, and they should not contribute to tropospheric ozone or acid deposition. For more information link to the program site at "http://www.afeas.org/about.html"
AFEAS