Cool.org (formerly Cool Australia) publishes Australian-Curriculum-mapped lessons; this Years 5–6 lesson uses the documentary Blue to explore plastic in the ocean with printables and a simple experiment. Australian Curriculum v9 content descriptions (Science, the Sustainability cross-curriculum priority and the UN Sustainable Development Goals (SDGs)) are listed per lesson, though you need a free teacher login to see the codes.
Who made and funded this: Cool.org, an Australian education not-for-profit funded by philanthropy and partnerships (check current partners on their site). How to use it: the Australian equivalent of Plastic Free Schools' units; capture the codes after login for your planning. Free with teacher login; link only.