Changes

CFCs are very stable in the [[troposphere]]. They move to the [[stratosphere]] and are broken down by strong ultraviolet light, where they release chlorine radicals that act as a catalyst in the breakdown of [[ozone]] into [[oxygen]].

CFCs are very stable in the [[troposphere]]. They move to the [[stratosphere]] and are broken down by strong ultraviolet light, where they release chlorine radicals that act as a catalyst in the breakdown of [[ozone]] into [[oxygen]].

In 1984, scientists discovered CFCs to be one cause of the depletion of the [[ozone]] layer,{{fact-science}} which acts as a filter for ultraviolet radiation from the [[Sun]]. Because of this, many nations signed the Montreal-London Protocol. This [[treaty]] called for the production of CFCs to be stopped by the year 2000 for industrialized countries and the year 2010 for developing countries. The United States stopped production of CFCs in 1995, and alternate chemicals are used in their place.

In 1984, scientists discovered CFCs to be one cause of the depletion of the [[ozone]] layer,<ref>''Chlorofluorocarbons and Ozone Depletion'' [http://www.ciesin.org/TG/OZ/cfcozn.html]</ref> which acts as a filter for ultraviolet radiation from the [[sun]]. Because of this, many nations signed the Montreal-London Protocol. This [[treaty]] called for the production of CFCs to be stopped by the year 2000 for industrialized countries and the year 2010 for developing countries. The United States stopped production of CFCs in 1995, and alternate chemicals are used in their place.

The [[ozone depletion potential]] (ODP) for CFC-11, -12, -113, -114, and -115 is, respectively, 1, 1, 0.8, 1, and 0.6.

The [[ozone depletion potential]] (ODP) for CFC-11, -12, -113, -114, and -115 is, respectively, 1, 1, 0.8, 1, and 0.6.

[[Category:Chemistry]]

[[Category:Chemistry]]

[[category:Environment]]

[[category:Environment]]