In 2020 the Geneva Accords were passed requiring worldwide cuts in usage of coal power of around 20% compared to the levels of coal power in 2012. However, developing countries at the time (e.g. Poland and Romania) objected to this goal. Negotiations to replace the Geneva Accords with another binding agreement have repeatedly stalled due to developing and developed nations differing as to how coal usage should be cut.

Which of the following statements are true?


Nations should not go ahead with the proposal if the vertically summed MB exceeds the MC of a new agreement.


Developing nations' (such as Romania) refusal to cut coal usage can be seen as an example of the free rider problem.


Nations should agree to cut coal usage to as close to zero as possible because any positive level of coal power is inefficient.


Individual nations have an incentive not to cut their coal usage as they can freely enjoy the benefits from other nations contributing toward reducing global coal usage.