Apple Certification Exam 9L0 509

Because there is high uncertainty in the compliance costs of firms, some argue that the 9L0 509 optimum choice is the price mechanism.
However, some scientists have warned of a threshold in atmospheric concentrations of carbon dioxide beyond which a run-away effect could take place, with a large possibility of causing irreversible damages. If this is a conceivable risk then a quantity instrument 9L0 402 could be a better choice because the quantity of emissions may be capped with a higher degree of certainty. However, this may not be true if this risk exists but cannot be attached to a known level of GHG concentration or a known emission pathway