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Line 5: − Some scientists have measured a thinning layer of ozone over the north and south poles resulting from [[chlorofluorocarbons]], as they act as [[catalyst]]s to break down the O<sub>3</sub> molecules.<ref>http://ozonewatch.gsfc.nasa.gov/facts/hole.html</ref>+
It's not just some scientists - all scientists agree about the fact of the annual "ozone hole" thinning
In the stratosphere it serves a very important function, by acting to filter out most of the sun's ultraviolet radiation.
In the stratosphere it serves a very important function, by acting to filter out most of the sun's ultraviolet radiation.
Scientists have measured a thinning layer of ozone over the north and south poles resulting from [[chlorofluorocarbons]], as they act as [[catalyst]]s to break down the O<sub>3</sub> molecules.<ref>http://ozonewatch.gsfc.nasa.gov/facts/hole.html</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.