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natima [27]
4 years ago
13

HELP ASAP!!! 20 Points!

Biology
2 answers:
miss Akunina [59]4 years ago
7 0
The hole in the Ozone Layer
Semmy [17]4 years ago
6 0

Answer:

A.The hole in the ozone layer

Explanation:

  • Montreal protocol is an international treaty that was signed to control the use of substances that are resulting in the depletion of the ozone hole.
  • This treaty was signed in the year 1987 and became effective form 1989.
  • Since the time that this treaty has come into force, there has been a significant improvement in the ozone hole that was observed over Antarctic as it's size has decreased.
  • This improvement has been possible because the treaty helped to phase out chemicals such as chlorofluorocarbons, carbon tetrachloride, etc. that are responsible for ozone hole depletion.
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