Compared to Global Warming,addressing the Hole in the Ozone Layer

Compared to global warming,addressing the hole in the ozone layer is __________.

A) more complex,because the costs of solving the problem are higher
B) about the same,because in either case the costs to states' economies are very high
C) simpler,because the consequences of ozone depletion are better understood
D) more time-consuming,because of disagreement about the nature of the problem

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