Reduce, Reuse, Recycle
Before just throwing everything away, try to repurpose it for something else. Or at least see if you can recycle it. Materials like plastic and styrofoam are scattered all over our oceans, covering up to 40%, and terrestrial areas. Not only does it look horrific, but it's also a great danger to wildlife, who get tangled in it, smothered by it or ingests it.