According to the question, from August 2006 the picture on the right is from August 2015 which of these efforts has the most influence on the change between 2006 and 2015 option "D" The Montreal Protocal.
What is the Montreal Protocol?
The Montreal Protocol, finalized in 1987, is a global agreement to protect the stratospheric ozone layer by phasing out the production and consumption of ozone-depleting substances (ODS).
Thus, option "D" is correct.
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