Issues in Economics Today 7th Edition by Robert Guell

Exercise 7

When tackling local environmental problems, taxes and regulations can be useful. The reason that global problems (like global warming) are more difficult to control is
A) it is in every countries' aggregate interest to ignore the problem.
B) it is in no country's interest to address the problem.
C) there is no ability to enforce those taxes or regulations.
D) the "marginal" country is unknown.