Why Has Cooperation on Stopping Ozone Depletion Been Easier Than

Multiple Choice

Why has cooperation on stopping ozone depletion been easier than cooperation on reducing greenhouse gas emissions?

A) Ozone depletion is not subject to collective action problems.
B) Compared to the costs,the return on stopping ozone depletion is greater and more certain than stopping climate change.
C) States have had less time to address climate change.
D) There were no special interests that wanted to protect CFC production.