Plastic Waste Open Combustion

Total Plastic Waste Generated (Mt/yr)

Direct CO₂ from Combustion (Mt CO₂/yr)

Black Carbon Emissions (kt/yr)

BC has GWP₁₀₀ ~900 (range 100–1900; IPCC AR5); contributes meaningfully to near-term warming.

Dioxin / Furan Release (kg TEQ/yr)

TEQ = Toxic Equivalent. From PVC fraction (~12% of plastic waste). IARC Group 1 carcinogen.

Why Black Carbon Matters

Black carbon (soot) from open plastic burning is 2–4× more per tonne than biomass burning because plastics are carbon-rich and burn at lower temperatures with less oxygen. BC absorbs solar radiation directly in the atmosphere and when deposited on ice/snow, accelerating glacier and sea-ice melt.

The GWP₁₀₀ of BC is highly uncertain (IPCC AR5 range: 100–1,900 CO₂e/tonne; central ~900) because BC residence time and optical properties vary significantly. Even the lower bound makes plastic-derived BC a significant near-term warming agent.

Dioxin Health Burden

Polychlorinated dibenzo-p-dioxins and furans (PCDD/F) from PVC combustion are classified as IARC Group 1 carcinogens. The 2016 WHO global health burden estimate attributed ~8–10% of total cancer from dioxin exposure to open burning.

Unlike CO₂ which disperses globally, dioxins accumulate locally — communities within 2–5 km of major dump burn sites have measurably elevated blood dioxin levels. Children and pregnant women are most exposed. This is primarily a health equity issue: the communities that burn are not those that produced most of the plastic.

Finance Asymmetry

The countries with the highest open burning rates have the least fiscal space to fund waste collection infrastructure. A universal collection system for a country of 50 million requires ~$500M–$2B in capital expenditure and sustained operational funding — prohibitive for many LMICs without international support.

This is the core deadlock in the Global Plastics Treaty: LMIC negotiators want a finance mechanism before committing to open burning elimination timelines; OECD donors want commitments before funds. INC-5 in Busan failed partly on this point.

Agricultural Plastic: The Hidden Contributor

Agricultural plastic mulch film (~6–7 Mt/yr globally) is almost entirely burned on-site after use — even in OECD countries. Recycling agricultural film is economically unviable at current plastic prices because contamination (soil, fertiliser) makes it unsuitable for most recycling streams.

China alone uses ~1.4 Mt of mulch film annually; on-field burning is the dominant disposal method. The EU introduced agricultural plastic take-back requirements in 2022 but enforcement is inconsistent, and no equivalent framework exists in most LMICs.

Key Negotiating Blocs

High Ambition Coalition (HAC): EU, UK, Canada, small island states, Norway. Wants legally binding production caps, mandatory recyclability by design standards, and a specific open burning elimination date (2030 proposed).

Oil-state bloc: Saudi Arabia, Russia, Iran, plus US under post-2024 administration. Opposes production caps; wants treaty limited to waste management only; no binding timeline on burning.

LMIC bloc: India, Indonesia, Brazil, much of Africa. Broadly supports burning elimination but requires finance mechanism first; opposes unfunded mandates; want technology transfer provisions.

What a Treaty Needs to Cover

On open burning specifically: A phase-out date, national implementation plans, definition of "controlled incineration" exemptions (waste-to-energy vs open burn), monitoring and reporting requirements, and the financing window for LMIC infrastructure.

Enforcement gap: Even with a treaty, open burning is extremely difficult to monitor — it occurs in rural areas, dump sites, and households, not at large industrial facilities with stack permits. Remote sensing (Sentinel, Landsat thermal anomaly detection) is emerging as a monitoring tool but attribution to plastic vs biomass burning requires multi-spectral analysis.