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" These observations reinforce concerns about the frailty of Earth's ozone layer. Although production of ozone-destroying gases has been curtailed under international agreements, concentrations of the gases in the stratosphere are only now reaching their... "
NASA and the environment the case of ozone depletion - Page 43
by W. Henry Lambright
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A Textbook in Environmental Science

V. Subramanian - Science - 2002 - 252 pages
...reinforce concerns about the frailty of Earth's ozone layer. Although production of ozone destroying gases has been curtailed under international agreements,...decades before the ozone hole is no longer an annual occurrence," said Dr. Michael J. Kurylo, of NASA Headquarters. Ozone molecules, made up of three atoms...
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