redOrbit: Chemicals that helped solve a global environmental crisis in the 1990s — the hole in Earth’s protective ozone layer — may be making another problem — acid rain — worse, scientists are reporting. Their study on the chemicals that replaced the ozone-destroying chlorofluorocarbons (CFCs) once used in aerosol spray cans, air conditioners, refrigerators, and other products, appears in ACS’ Journal of Physical Chemistry A, a weekly publication. Jeffrey Gaffney, Carrie J. Christiansen, …