Why are efforts to build an international regime to control climate change on a shared objective likely to fail?

a. Climate change cannot be controlled by an international regime.
b. International regimes almost never have specific, concrete objectives.
c. It only takes one country not to join, and the entire regime will come apart.
d. The United States will never sign on to anything that restricts its right to emit greenhouse gases.
e. Countries do not share the same assessments of the dangers and opportunities presented by climate change.

Answer: e