Just planting an idea in your head that will make you famous: Collect a heap of trash like that (when you come across something like that again), but do it like scientists do, complete with gloves and forensic bags used for gathering evidence. Take it home, start a crowdfunding campaign to pay for lab costs, then send the trash to a lab for fingerprints, DNA on there, etc. Basically, hunt down environmental killers while blogging or vlogging about it. Play sleuth, find the dumpsters. Such a mission will go viral, get you onto the news, and get those trashers caught, as a warning to others. It will send a message that ordinary people care for our planet, and won't wait for the cops to catch such criminals any longer.
RE: Making a small effort