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kay20213 kay20213
wrote...
7 years ago
With immediate and sustained action to stop production of all ozone-depleting chemicals:
 
  a. The ozone-hole problem will be solved immediately.
  b. It will take about 5 years for the earth's ozone layer to recover to 1980 levels.
  c. It will take about 30 years for the earth's ozone layer to recover to pre-1950 levels.
  d. It will take about 60 years for the earth's ozone layer to recover to pre-1950 levels.
  e. It will take about 60 years for the earth's ozone layer to recover to 1980 levels.
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