There is no single winner. Life cycle assessments (LCAs) of wood and plastic pallets generally find that wooden pallets have a lower carbon footprint per trip, while plastic pallets can narrow or close the gap when they make very many trips in a controlled return loop. The result depends on trip count, return rate, pallet weight, end-of-life route and what the study counts.
How pallets are compared
An LCA adds up the environmental effects of a product across its life: raw material extraction, manufacturing, transport, use, repair and end of life. Results are expressed per functional unit, for example per pallet trip or per tonne-kilometer of goods moved. This unit matters: a plastic pallet that lasts 100 trips must be compared with many wooden pallets or repaired wooden pallets, not with one.
Common impact categories are greenhouse gas emissions (global warming potential), fossil energy use, water use, acidification and waste. Studies differ in which categories they report and in system boundaries, such as whether wood carbon storage is credited, so numbers from different studies cannot be placed side by side without care.
What the research reports
A widely cited peer-reviewed study by Anil, Ma, Kremer, Ray and Shahidi in the Journal of Industrial Ecology (2020) compared wooden and plastic pallets using a life cycle approach. According to the published summary, wooden pallets treated by conventional heat treatment had a carbon footprint about 72% to 80% lower than plastic pallets on a single-trip basis, depending on treatment. The authors also found that fumigation with methyl bromide added a higher carbon burden than conventional or radio frequency heat treatment, and suggested dielectric (radio frequency) heating as a promising low-carbon option.
Other LCAs, many funded by pallet manufacturers or pooling companies, reach different conclusions depending on assumptions. That does not make them wrong, but a reader should check who commissioned a study, how many trips were assumed for each material and how wood carbon storage was treated.
| Factor | Tends to favor wood | Tends to favor plastic |
|---|---|---|
| Material origin | Renewable, low-energy processing, stores carbon while in use | Can contain recycled content |
| Number of trips | Few trips, or repair keeps pallets circulating | Very many trips in tightly controlled loops |
| Weight | Moderate (about 25 kg for a Euro pallet) | Often lighter in some designs, which reduces freight emissions |
| Treatment | Heat treatment is low impact, methyl bromide is higher | No treatment needed |
| End of life | Chipped, recycled or burned for energy | Reground into new plastic products |
| Hygiene | Can absorb moisture and contamination | Washable, which suits food and pharma needs |
The trip count question
Plastic pallets cost far more energy and fossil material to make than wooden ones, so they need to make many trips to break even environmentally. Whether they do depends on the loop. In a closed loop, such as a factory and a small group of customers who reliably return pallets, plastic may complete dozens or hundreds of trips. In open networks, with pallets leaving the loop, being lost or being stored for long periods, the effective trip count is lower and the advantage shrinks.
Wooden pallets are easy to repair and are produced close to where they are used, which reduces both material demand and transport emissions. Repair keeps the average wooden pallet in service far longer than its original build would suggest; see pallet repair and the full wood vs plastic comparison.
End of life and recycling
Wooden pallets that are too damaged to repair can be chipped for particleboard, animal bedding or fuel, which recovers value and, for biomass, displaces fossil energy. The routes are described in pallet wood waste as biomass and raw material. Contaminated or chemically treated wood is more restricted.
Plastic pallets are typically made from high-density polyethylene or polypropylene, and broken units can be reground and re-molded. Recycling works well when pallets are collected and separated by polymer; in practice, mixed or contaminated plastic, or pallets leaving formal loops, can end up in landfill or incineration. See plastic pallets.
Metal and paper pallets sit at the edges of this comparison; see metal pallets and paper and corrugated pallets.
Wood sourcing and forests
The environmental case for wood depends on sustainable sourcing. Responsibly managed forests regrow the wood used, and pallet makers often use low-grade logs and sawmill residues that have few other uses. Poorly sourced timber or illegal logging would undermine the benefit. Certification and legal frameworks, covered in FSC and PEFC certification and the EU Deforestation Regulation, address this risk.
Practical guidance
A balanced decision uses the following checks:
- Define the loop. Is the pallet part of a closed loop with reliable returns, or does it leave your control?
- Count realistic trips, not theoretical lifespan.
- Include repair, cleaning and return transport for each option.
- Check hygiene requirements. Food and pharmaceutical supply chains sometimes need washable surfaces.
- Look at weight, since a lighter pallet lowers fuel use across many shipments.
- Verify treatment and sourcing for wooden pallets, including heat treatment under ISPM 15.
Frequently asked questions
Are wooden pallets better for the environment than plastic?
In many LCAs they have a lower carbon footprint per trip because wood is renewable and needs little processing. Plastic can compete when it makes very many trips in a closed loop, so the answer depends on use.
Does heat treatment or methyl bromide have a larger footprint?
The 2020 Journal of Industrial Ecology study found methyl bromide fumigation had a higher carbon burden than conventional or radio frequency heat treatment.
Can plastic pallets be recycled?
Yes, usually by regrinding and re-molding, but it requires collection and separation. Contaminated or mixed plastic is harder to recycle.
Which is better for food supply chains?
Hygiene often drives the choice there. Plastic pallets are easy to wash, while wooden pallets must be kept clean and dry, and the choice depends on the audit standards of the customer.
Sources
- Life cycle assessment comparison of wooden and plastic pallets in the grocery industry — Journal of Industrial Ecology, via Penn State
- Life cycle analysis underscores environmental challenges of plastic pallets — Pallet Enterprise
- Recovery, reuse and recycling by the United States wood packaging industry: 1993-2006 — USDA Forest Service
- ISPM 15 (2018): Regulation of wood packaging material in international trade — International Plant Protection Convention