CFC Replacements Act as Super Greenhouse Gases, Study Says

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.

This forest was damaged by acid rain, which contains a corrosive ingredient that can result from the breakdown of chemicals that help protect the Earth’s ozone layer. Wikimedia Commons image

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 Journal of Physical Chemistry A, a weekly publication.

Jeffrey Gaffney, Ph.D.; Carrie J. Christiansen, Shakeel S. Dalal, Alexander M. Mebel and Joseph S. Francisco from the University of Arkansas at Little Rock point out that hydrochlorofluorocarbons (HCFCs) emerged as CFC replacements because they do not damage the ozone layer. However, studies later suggested the need for a replacement for the replacements, showing that HCFCs act like super greenhouse gases, 4,500 times more potent than carbon dioxide. The new study adds to those concerns, raising the possibility that HCFCs may break down in the atmosphere to form oxalic acid, one of the culprits in acid rain.

They used a computer model to show how HCFCs could form oxalic acid via a series of chemical reactions high in the atmosphere. The model, they suggest, could have broader uses in helping to determine whether replacements for the replacements are as eco-friendly as they appear before manufacturers spend billions of dollars in marketing them.

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