SubjectToClimate's teacher guide indexes plastic pollution lessons from many providers, tagged by grade and US standards, for example 'School Hydration Stations' (grades 3–12), 'Garbage Patches' (3–5) and 'Recycling' (K–2). It is a finding aid rather than a curriculum; vet each item's provenance before using it.
Who made and funded this: SubjectToClimate, a US non-profit funded by foundations. Items are for educational use with attribution to the original provider. How to use it: search here when you need a lesson on a specific sub-topic we do not cover. Link only.