What could be the impact to the people if there is only one climatic zones?

Do you guys know all the answers to this

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

Physical features of central america look at the map above which of the following is true