When Bali is mentioned, many people think of sunny beaches, but now there are piles of plastic waste on the shores.

This is causing great trouble for both foreign tourists and local fishermen.

The United Nations estimates that around 20 million tons of garbage enter the global aquatic ecosystem every year.

Because the garbage is constantly moved by ocean currents, some areas are even described as “garbage soup.”

In Bali, this garbage has become a major problem for both tourists and locals.

Ranked Startup Opportunities: From Waste to Wealth

1. The “Plastic Ledger” – Micro-Franchise Collection (Most Viable)

The Specific Problem: Informal waste pickers and local fishermen lack the financial incentive and logistical tools to track and sell small-scale collections efficiently. How it Works: This is a mobile-first “Banking for Waste” platform. Local collection points (micro-hubs) use a digital app to log plastic by weight and type. Fishermen “harvest” plastic instead of fish on bad weather days, and the app uses QR codes to provide immediate “Plastic Credits” redeemable for cash or local services. Why it Succeeds: Target audience is local communities and ESG-focused corporations. It turns cleanup into a reliable, distributed workforce. Revenue comes from selling “Cleaned-by-Human” credits to international brands looking to offset their plastic footprint. Uniqueness: Unlike big non-profits, this focuses on Hyper-Local Traceability. Every gram is logged to a specific individual, ensuring the social “S” in ESG is met alongside the environmental “E.”

2. “TrashBoom” – Open-Source River Interception (Best for Scale)

The Specific Problem: 80% of ocean plastic comes from rivers. Intercepting it at sea is too late and too expensive. How it Works: Utilizing low-cost, locally sourced materials (PVC piping, wire mesh), these floating barriers are deployed across river estuaries. How it’s Designed: A simple “curtain” design that allows fish to swim beneath but catches surface-level “garbage soup.” Why it Succeeds: Governments and tourism boards (like Bali’s) are the primary clients. It’s low-cost to build, repairable by local mechanics, and prevents the “beach cleanup” cost entirely by stopping the waste upstream. Uniqueness: The Open-Source Hardware model. Instead of selling the machine, the company sells the setup, training, and maintenance contracts, allowing the technology to spread faster than any proprietary device.

3. “Circular Bricks” – Low-Heat Extrusion Construction (Most Tangible)

The Specific Problem: Collected ocean plastic is often “low-value” (sachets, dirty films) and rejected by high-end recyclers. How it Works: Using low-heat extrusion machines (which don’t release toxic fumes), the company melts mixed, unwashed plastics into interlocking construction blocks or “plastic lumber.” Why it Succeeds: The output—durable, rot-proof building materials—is sold to the local hospitality industry for beach walkways, furniture, and temporary structures. It creates a closed-loop economy on the island. Uniqueness: It solves the “Contamination Problem.” High-tech recycling needs pure plastic; this method thrives on the “garbage soup” mix, turning a liability into a structural asset.

4. “Vision-Sweep” – AI Autonomous Interceptors (Advanced High-Tech)

The Specific Problem: Massive garbage patches in open currents are hard for humans to reach safely or efficiently. How it Works: Solar-powered, autonomous surface vessels (ASVs) equipped with AI-vision sensors. These drones identify high-density waste zones using satellite data and navigate autonomously to “swallow” the debris. Why it Succeeds: Target audience is international maritime organizations and large-scale government projects. It functions as a “Roomba for the Ocean.” Uniqueness: Smart Sorting. While moving, the onboard AI distinguishes between organic driftwood/marine life and plastic, significantly reducing the “bycatch” problem common in traditional netting.

Strategic Recommendation: Where to Start?

The best starting point is Idea #1 (The Plastic Ledger).

Reasoning: It requires the lowest capital expenditure (software vs. heavy machinery) and leverages the existing “informal” workforce.

By providing the financial infrastructure first, you create a steady supply of raw materials that can then feed into Idea #3 (Circular Bricks) as you scale.