Question

the positive effect on the environment that the kyoto protocol intended to achieve failed because developing countries were exempt failed because the us did not sign the agreement succeeded because overall emissions were reduced succeeded because all countries signed the agreement

Explanation:

The Kyoto Protocol aimed to reduce greenhouse - gas emissions. However, the United States, a major emitter, did not ratify the agreement. While some countries made efforts, the overall impact was limited. Developing countries were exempt from binding emission - reduction targets under the original protocol, but this was not the main reason for its failure in terms of achieving its full environmental goals. Also, not all countries signed the agreement, and overall emissions were not significantly reduced in a way that could be considered a full success of the protocol's environmental goals.

Answer:

B. failed because the US did not sign the agreement.