The text roughly outlines four categories of policies the government uses to protect the environment: Command and Control, Marketable Permits, Pollution Charges, and Defined Property Rights. Label each of the following potential government interventions by the policy categories listed above.

a. Charging a coal-fired plant $23 per ton of carbon emitted.

b. Provided permits to local manufacturing plants for 100,000 tons of CO2 and allowing them to buy and sell with each other.

c. Providing legal property rights over a stream to a local fishery so they can pursue damages from a lab polluting the stream.

d. Requiring all newly produced cars and light duty trucks to achieve 54.5 miles per gallon in 2025.