Most plastic waste ends up in landfills. Globally, about 54% of collected plastic packaging goes to landfills, 21% is sent for recycling, and 12% is incinerated. The remaining share is never collected at all, roughly 19% of all plastic waste escapes formal waste systems entirely and pollutes land, air, and waterways. That adds up to about 130 million metric tons of plastic entering the environment each year.
Landfills Hold the Majority
More than half of all collected plastic packaging is buried in landfills, where it stays largely intact for centuries. A standard plastic water bottle made from PET has an estimated half-life of 110 years when buried in soil, meaning half its mass remains after a century. Thicker plastics like HDPE bottles (the kind used for milk jugs and detergent) have an estimated half-life of 250 years underground. Full degradation takes far longer than those half-life figures suggest.
While sitting in landfills, plastic doesn’t just take up space. It slowly releases chemical additives into the surrounding soil and groundwater through a liquid called leachate. Plastics contain compounds like bisphenol A (BPA), phthalates, and flame retardants that were added during manufacturing. BPA, which can interfere with hormone function, shows up in landfill leachate at concentrations ranging from 1.3 to 17,200 micrograms per liter. One study found 441 kilograms of BPA in a single landfill’s total leachate output. Groundwater near landfills is now considered a major source of microplastic contamination.
Rivers Carry Plastic to the Ocean
Plastic that isn’t collected by waste services often washes into rivers and eventually reaches the sea. Between 0.8 and 2.7 million metric tons of plastic flow into the ocean through rivers every year. This isn’t driven by just a handful of massive waterways. More than 1,000 rivers account for 80% of all riverine plastic reaching the ocean, and small urban rivers are among the worst contributors. The ten largest emitting rivers together account for roughly 50 to 60% of total river-borne plastic pollution.
Once in the ocean, plastic degrades faster than on land because of UV exposure and wave action, but “faster” is relative. An HDPE bottle has a marine half-life of about 58 years, and full degradation takes an estimated 116 years. PET bottles may degrade more quickly in seawater, with a half-life around 2.3 years, but they break into smaller and smaller fragments rather than disappearing. Those fragments become microplastics.
Microplastics Travel Through the Air
Plastic pollution isn’t limited to water and soil. Tiny plastic particles, smaller than five millimeters, become airborne and travel through the atmosphere. Research measuring atmospheric deposition over a coastal bay found an average of 75 particles landing per square meter per day, which translated to an estimated 1.94 trillion microplastic particles entering that single bay annually from the air alone. This atmospheric pathway means microplastics now show up in remote mountain ranges, polar ice, and deep ocean sediments, places far from any plastic source.
Agricultural Soils Accumulate Plastic
Farmland is another major destination for plastic waste, though it’s less visible than ocean pollution. Farmers worldwide use thin plastic films to cover soil, retain moisture, and control weeds. These films tear during use and are difficult to fully recover. In China, where plastic mulch film is used extensively, the average residual plastic left in agricultural soil ranges from 60 to 90 kilograms per hectare. In cotton fields that have been continuously farmed for 20 years, residues can reach 232.8 kilograms per hectare.
This accumulated plastic reduces soil ventilation and permeability, making it harder for water and air to reach plant roots. Over time, it impairs crop growth. Degradable film alternatives can reduce soil residue by 56 to 74% compared to conventional plastic film, and some studies show they actually improve crop yields. But conventional plastic film remains the default in most regions.
Recycling Handles a Small Fraction
Only about one in five plastic packages sent to waste facilities actually gets recycled. The rest is landfilled or burned. Incineration, which accounts for roughly 12% of collected plastic packaging, destroys the material but releases carbon dioxide and requires energy-intensive pollution controls. Recycling rates have barely budged over time: projections suggest the recycled share will actually slip from 21% to 19% by 2040 if current policies hold.
The OECD projects that global plastic waste will nearly triple by 2060 under existing policies, with half still going to landfills and less than a fifth recycled. Meanwhile, the share of plastic that goes entirely uncollected could nearly double, from 19% to 34% by 2040, as waste generation outpaces infrastructure in growing economies.
Where It Ends Up Depends on Where You Live
In high-income countries, nearly all plastic waste is collected, but it mostly goes to landfills or incinerators rather than recycling facilities. In lower-income countries, collection infrastructure often doesn’t reach entire neighborhoods or rural areas, so a larger share of plastic enters the environment directly through open dumps, drainage channels, and rivers. The uncollected fraction is the primary driver of ocean plastic pollution.
The short answer: your plastic bottle or food wrapper most likely ends up buried in a landfill, where it will sit for centuries while slowly leaching chemicals into the ground. A smaller portion is incinerated or recycled. And a significant share, particularly in regions without reliable waste collection, escapes into rivers, soil, and the atmosphere, where it fragments into microplastics that now reach essentially every ecosystem on Earth.