Siteadmin, Check users, nsTeam1RO, nsTeam1RW, nsTeam1_talkRO, nsTeam1_talkRW, oversight, Administrators
30,650
edits
Changes
Jump to navigation
Jump to search
Line 7:
Line 7: − +
Chlorofluorocarbons (CFCs) themselves are not involved in the catalytic process
Scientists have measured an annual, tempororary thinning layer of ozone over the north and south poles, called an "ozone hole".<ref>http://ozonewatch.gsfc.nasa.gov/facts/hole.html</ref>
Scientists have measured an annual, tempororary thinning layer of ozone over the north and south poles, called an "ozone hole".<ref>http://ozonewatch.gsfc.nasa.gov/facts/hole.html</ref>
What is controversial is much of this is a result of the breakdown of [[chlorofluorocarbons]] and the release of elemental [[chlorine]], which acts as [[catalyst]]s to break down the O<sub>3</sub> molecules.
What is controversial is much of this is a result of the breakdown of [[chlorofluorocarbons]] and the release of elemental [[chlorine]], which acts as [[catalyst]]s to break down the O<sub>3</sub> molecules.<ref>Chlorofluorocarbons (CFCs) themselves are not involved in the catalytic process; upon reaching the stratosphere, they are subject to higher levels of ultraviolet radiation that decompose the CFC and release atomic chlorine. [http://www.ciesin.columbia.edu/TG/OZ/ozndplt.html Catalytic destruction of ozone] </ref>
*In April 1991, the Environmental Protection Agency announced that ozone levels in the Northern Hemisphere shrank as much as 5 percent over the United States in the past 10 years.
*In April 1991, the Environmental Protection Agency announced that ozone levels in the Northern Hemisphere shrank as much as 5 percent over the United States in the past 10 years.