Here are some resources for bringing attention to the samples of trash you pick up with your trawl. We are building this site out. It will eventually have resources at the national level. We then hope to expand to providing resources at the international level as well.
With Resistbot, you just have to text "resist" to 50409, and the app will ask you for your name and zip code, at which point you can write a message to your representatives which Resistbot will automatically turn into a fax and send it to your local representative. Currently, you must have a US number to use this service.