[20 pts] While the control variable for novel entities remains undefined, evidence suggests it is transgressed, and defining a control variable is essential for operating within the planetary boundary. In this context, analyze each control variable approach, describing one strength and one weakness, while discussing the criteria that inform the selection of control variable options (i.e., feasibility, relevance, comprehensiveness).

a. [10 pts] Trend in the production of plastics.

b. [10 pts] Trend in release quantities of plastics into the environment.