Tuesday, August 9, 2011

Is the ozone hole is still growing or its growth had stopped?

Wikipedia says, "On August 2, 2003, scientists announced that the depletion of the ozone layer may be slowing down due to the international ban on CFCs (chlorofluorocarbons). Three satellites and three ground stations confirmed that the upper atmosphere ozone depletion rate has slowed down significantly during the past decade. The study was organized by the American Geophysical Union. Some breakdown can be expected to continue due to CFCs used by nations which have not banned them, and due to gases which are already in the stratosphere. CFCs have very long atmospheric lifetimes, ranging from 50 to over 100 years, so the final recovery of the ozone layer is expected to require several lifetimes."

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