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How Many Years Would It Take for Earth to Recover

Question 46

Multiple Choice

How many years would it take for Earth to recover to pre-1950 ozone levels if all of the ozone-depleting substances were banned tomorrow? 


A)  about 50 years 
B)  about 75 years 
C)  about 100 years 
D)  about 125 years

Correct Answer:

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