Truly Circular Plastic Recycling
Only about 9% of plastic is recycled worldwide; the goal is to turn plastic into new plastic indefinitely without quality loss.
Open in the interactive tree →Of the 6.3 billion tonnes of plastic waste generated up to 2015 (from 8.3 billion tonnes made), only about 9% was recycled, 12% incinerated and 79% ended up in landfill or the environment. Mechanical recycling degrades quality (mixtures, additives, colors), and chemical recycling (pyrolysis, depolymerization) needs a lot of energy. Annual production passed 380 million tonnes in 2015 and could reach about 800 million by 2040 without intervention.
As of October 2026
The OECD's Global Plastics Outlook (2022) puts the recycled share of plastic waste at about 9% (2019); annual production is now above 400 million tonnes. The UN plastics treaty talks failed in Geneva (INC-5.2, August 2025) without agreement; INC-5.3 (7 February 2026) was mainly administrative and elected a new chair. As of late summer 2026 the negotiations remain deadlocked. Technical processes exist for single-type plastics, but mixed plastics, microplastics and multilayer packaging remain unsolved.
What is missing
- Economical processes for mixed plastics and composite packaging
- Catalysts or enzymes that break polyolefins (PE and PP, about half of all plastics) into monomers at low energy
- Collection and sorting systems worldwide
- A political framework: a binding treaty and a price on virgin plastic
Becomes possible once solved
- A closed plastics cycle
- An end to microplastic input from waste
- Less oil in the chemical industry
Open steps
- Breaking PE and PP at low energy Medium AI leverageFind catalysts or enzymes that cut polyethylene and polypropylene, about half of all plastics, into reusable monomers or oils at low temperature.
- Sorting mixed and multilayer waste High AI leverageIdentify and separate polymer types, colors and multilayer packaging at conveyor speed so recyclers receive clean streams.
- Recyclability of additive-laden streams Medium AI leveragePredict which waste streams can be mechanically recycled and which need chemical routes, given additives, colorants and degradation history.
- Lower-energy chemical recycling Medium AI leverageCut the energy and carbon cost of pyrolysis and depolymerization so chemical recycling beats virgin plastic on life-cycle emissions.
Where AI could help
Medium AI leverage. AI helps with sorting and with enzyme and catalyst design; cost, collection and stalled treaty talks remain the main blockers.
- Engineer enzymes and catalysts that cut polyolefins and other hard plastics at lower energy
- Computer-vision robots that sort mixed and multilayer waste streams
- Predict which additive-laden streams can be recycled mechanically and which need chemical routes
- Optimize conditions of pyrolysis and depolymerization plants
Shown so far
- In April 2022 a University of Texas team used a structure-based machine-learning model to engineer the enzyme FAST-PETase, which broke down 51 post-consumer PET products so the monomers could be re-polymerized (Nature). source
Prerequisites
- Catalysis1835
- Plastics (Bakelite to Nylon)1907-1953
- Cracking & Petrochemicals1913Most plastics are petrochemical products, which is why recycling matters
- Green Chemistry1998Designing recyclable plastics follows green-chemistry principles
Unlocks
- Closed Plastic Cycle2040s?