Please use the attached to answer the question 150-200 words. What is Marginal S

Please use the attached to answer the question 150-200 words. What is Marginal S

Please use the attached to answer the question 150-200 words. What is Marginal Social Cost of Abatement and what is it used for?
Callan, S., & Thomas, J. (2013). Environmental Economics & Management Theory, Policy, and Applications. (6th ed.). Cengage Learning. Pls 83-84