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What are the most effective current technical solutions for Ocean Pollution? Looking for real-world examples [Student Project]

Hi all,
I am a Mechanical Engineering undergraduate from India (RIT Kottayam), working on a project related to Ocean Pollution.

I have studied the main problems: microplastics, oil spills,and chemical runoff. But I am struggling to find which *technical solutions are actually working at scale* right now.

I would love to discuss:

*1. Prevention Tech:* Are solutions like The Ocean Cleanup, Seabins, river interceptors

*2. Detection / Monitoring:* What tech is used to track microplastics or oil spills? (Drones, satellite imaging, AI models, sensors?)

*3. Material / Engineering side:
alternatives to fishing nets, better filtration systems on ships, or waste-to-value tech.

*My specific questions:*
- Which solution do you think has the highest real impact?
- Are there any open-source projects or research papers you recommend?
- What is the biggest engineering challenge that is still unsolved?

I want to understand the gap between theoretical ideas and what actually works in the ocean. Any links, experiences, or technical insights would be a huge help for my project.
Thanks in advance!