There are other way for styrofoam cup to pollute ocean. Plastic disposal or recycling method used to (maybe still are) simply exported to or become a landfill.

There are other way for styrofoam cup to pollute ocean. Plastic disposal or recycling method used to (maybe still are) simply exported to or become a landfill. It will eventually degraded to micro-plastic, which follow water-flow and end up in ocean.