Loading ...
Sorry, an error occurred while loading the content.

Ozone Layer Has Stopped Shrinking, U.S. Study Finds

Expand Messages
  • mtneuman@juno.com
    Ozone Layer Has Stopped Shrinking, U.S. Study Finds The ozone layer has stopped shrinking but it will take decades to start recovering, U.S. scientists
    Message 1 of 1 , Sep 7, 2005
    • 0 Attachment
      Ozone Layer Has Stopped Shrinking, U.S. Study Finds



      The ozone layer has stopped shrinking but it will take decades to start
      recovering, U.S. scientists reported Tuesday. They said an international
      agreement to limit production of ozone-depleting chemicals has apparently
      worked, but the damage to ozone has not been halted completely.



      An analysis of satellite records and surface monitoring instruments shows
      the ozone layer has grown a bit thicker in some parts of the world, but
      is still well below normal levels, the scientists report in Wednesday's
      issue of the Journal of Geophysical Research.

      Elsewhere, the decline in ozone levels has stabilized, said Betsy
      Weatherhead, a researcher at the University of Colorado at Boulder and
      the National Oceanic and Atmospheric Administration. "The observed
      changes may be evidence of ozone improvement in the atmosphere," she said
      in a statement.



      The experts credited, at least in part, the 1987 Montreal Protocol which
      was ratified by more than 180 nations and set legally binding controls
      for on the production and consumption of ozone-depleting gases containing
      chlorine and bromine.



      The prime suspects in ozone destruction are chlorofluorocarbons, or CFCs,
      once commonly used in refrigeration, air conditioning and industrial
      cleaning. "These early signs indicate one of the strongest success
      stories of international cooperation in the face of an environmental
      threat," said NOAA administrator Conrad Lautenbacher.

      Weather head noted that methane levels, water vapor and air temperatures
      will continue to affect future ozone levels. "Even after all chlorine
      compounds are out of the system, it is unlikely that ozone levels will
      stabilize at the same levels," she said.

      "Chemicals pumped into Earth's atmosphere decades ago still are affecting
      ozone levels today," said Sherwood Roland of the University of California
      Irvine. "This problem was a long time in the making, and because of the
      persistence of these chlorine compounds, there is no short-term fix."



      The ozone layer remains so thin that cancer-causing ultraviolet radiation
      is still getting through. "This study provides some very encouraging
      news," said Mike Repacholi of the World Health Organization. "But the
      major cause of skin cancer is still human behavior, including tanning and
      sunburns that result from a lack of proper skin protection."



      Source: Reuters, 31 August 2005

      Clean Energy NEWS

      Vol. 5, Number 39, 06 September 2005
    Your message has been successfully submitted and would be delivered to recipients shortly.