a.  [10 pts] Explain why gaseous chlorofluorocarbon (CFC) compounds are considered novel entity substances and a Planetary Boundary Threat. Describe how each condition (i.e., persistence, mobility, and potential impact) is met or not met.

b.  [10 pts] Explain why plastics are considered a Planetary Boundary Threat and describe three solid waste management strategies for mitigating plastic pollution. Rank the strategies from most preferred to least preferred.