home *** CD-ROM | disk | FTP | other *** search
- THE WEEK, Page 24HEALTH & SCIENCECork That Volcano
-
-
- Ash and particles in the air seem to make the ozone hole worse
-
-
- The primary cause of the hole in the Earth's protective ozone
- layer is a group of man-made chemicals called
- chlorofluorocarbons (CFCs), used in refrigerators, air
- conditioners and plastic foams. The chlorine released when these
- compounds decompose attacks ozone, letting dangerous ultraviolet
- light from the sun shine through.
-
- But a report in Nature suggests that nature can help the
- process along. Ozone depletion was expected to be reasonably
- mild in 1991; instead, it was severe. That year also saw major
- eruptions by Mount Hudson in Chile and Mount Pinatubo in the
- Philippines. Volcanoes release enormous amounts of dust. Dust,
- along with ice crystals, provides surfaces where
- ozone-destruction chemistry works most efficiently.
- Unfortunately, while the industrial world is phasing out CFCs
- before the turn of the century, other compounds are also ozone
- destroyers -- and volcano control is somewhat farther off.
-
-
-
-
-
-
-