Hole(s) by BruceM

Question 8

The thinning of ozone over Antarctica (commonly known as the "hole in the ozone layer") led to the signing of a 1987 protocol restricting the use of CFCs (chlorofluorocarbons), named for which North American city?

(Unrelatedly, the "Great Peace of" [this city] was a treaty signed in 1701.)

Montreal

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