A recent Environmental Education Feature was on Redesigning Plastics. This was one of a series of lesson plans from the Ellen MacArthur Foundation [EMF]. You can find more plans, as well as videos, graphics, articles and case studies in their circular economy resource map.
EMF says, browse through and download the resources to get a better sense of how connected everything is.
Challenging Common Conceptions Exploring the Circular Economy Understanding the Challenge of Finite Resources
Designing for a Circular Economy The Circular Economy and Modern Agriculture Redesigning Plastics