pls answer below quastions in details ASAP

a) What are Pigouvian taxes and explain the polluter pays principle?

b) Why do you think that the OECD recommended for the use of the economic instrument such as environmental taxes and carbon trading mechanism to protect the environment from pollution?

c) Would the regulations from command-and-control work as an effective instrument in addressing the environmental issues, and do you think that your government should introduce carbon taxes? Give reasons to your answer.