The Montreal Protocol and Later Agreements Are Expected to Result

The Montreal Protocol and later agreements are expected to result in 60 million fewer cases of skin cancer in 2020 due to lower chlorofluorocarbon (CFC) levels in the atmosphere, than would have been the case without these agreements.Why was agreement on the Montreal Protocol possible in 1987 while agreement on reducing the level of carbon dioxide has been all but impossible?

A) The cost of pollution abatement today is much higher than it was in the 1980s. Thus, it would be far more costly to achieve the same level of pollution reduction now than it was in 1987.
B) The costs of reducing CFC emissions to efficient levels was lower than the cost of reducing carbon dioxide emissions to efficient levels.
C) Carbon dioxide levels are not very high in most Canadian cities.
D) It is better to tackle one problem rather than two.

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