NOAA has a full page of videos on marine debris and how to prevent it.
The state of California has a 2018 plan on preventing marine debris. Here are some highlights.
There is a good deal more in the report, such as the excerpt below. I think the point is this illustrates the substantial difference between the aspirational and wishful environmentalism of some organizations.
In particular, regarding various proposals in Massachusetts, such as plastic bag bans and despite the supposed embrace of metrics as management and policy tools, there is no effort underway to quantify statewide what the baseline or base rate and composition of plastic bag use is, so there is no way to judge effectiveness or ineffectiveness of policy. All that remains is legalistic rhetoric.