Quick answer: HDPE bale net wrap has a carbon footprint of about 1.6 kg CO₂e per kg of polymer produced (PlasticsEurope eco-profile 2022). On a per-bale basis that works out to roughly 0.13–0.18 kg CO₂e per round bale wrapped — less than half the footprint of equivalent twine. End-of-life recovery is the bigger lever: programs like Cleanfarms (Canada), ACRC (US ag plastics), and Revolution's grower take-back recycle wrap into new bags, mulch film, or trash liners. PFAS-free, biodegradability claims should be checked against ASTM D5511 test data.
Last updated: May 27, 2026
Whether bale net wrap is "good for the environment" is the wrong question. A more useful one: what's the lifecycle footprint of net wrap compared to the alternatives, and where in the lifecycle do operator choices actually move the number?
This article works through three pieces: the production-side carbon footprint of HDPE wrap, the end-of-life options (recycling vs. landfill vs. burning vs. soil), and an honest read on biodegradable wrap claims. Sources are linked so the numbers can be verified.
Production: HDPE vs. The Alternatives
Net wrap is high-density polyethylene (HDPE), the same polymer family as milk jugs and grocery bags. The PlasticsEurope eco-profile reports HDPE production at roughly 1.6 kg CO₂e per kg of resin (cradle-to-gate, 2022 figures). Compared to alternatives used in baling:
- HDPE net wrap: 1.6 kg CO₂e/kg resin. Net used per round bale: ~80–110 g. Per-bale footprint: ~0.13–0.18 kg CO₂e.
- Polypropylene twine: ~1.9 kg CO₂e/kg resin (slightly higher than HDPE). Twine used per round bale: ~200–280 g (longer wrap path). Per-bale footprint: ~0.38–0.53 kg CO₂e.
- Sisal twine: ~0.5 kg CO₂e/kg fiber for the fiber itself, but the picture is more complex — sisal is grown agriculturally (water, fertilizer, transport from Brazil/East Africa) and has a much shorter shelf life than synthetic options. Realistic per-bale footprint: ~0.25–0.45 kg CO₂e.
The HDPE-vs-PP-twine comparison is the relevant one for most US baling operations. Sisal is rarely used at scale outside specialty markets.
The Bigger Lever: Storage Loss Avoided
Production carbon is small compared to the avoided emissions from better hay preservation. A 1,200 lb round bale that loses 22% to outdoor weathering (typical for twine on bare ground) wastes about 264 lb of dry-matter. The replacement hay carries its own embedded carbon — diesel for cutting/baling/transport, fertilizer applied to growing the replacement forage. Iowa State University extension estimates the embedded carbon of round-bale hay production at roughly 0.10–0.15 kg CO₂e per pound of dry matter.
Replacing 264 lb of wasted bale therefore costs 26–40 kg CO₂e. Wrapping the original bale in net wrap (0.13–0.18 kg CO₂e) and dropping the loss rate from 22% to 14% saves enough hay to break even on the wrap's footprint roughly 180 times over. The net-wrap-vs-twine comparison turns on storage loss, not on the polymer.
End-of-Life: Three Honest Paths
1. Recycling (best — where available)
Used HDPE net wrap is technically recyclable. The challenge is collection. Three programs handle ag-plastic at meaningful scale in North America:
- Cleanfarms (Canada): National program with permanent collection sites in most provinces. Accepts grain bags, silage wrap, twine, and bale net wrap. 8,000+ tonnes collected annually as of 2024.
- Ag Container Recycling Council (US): Primarily focused on pesticide containers but coordinates regional ag-plastic recovery in 30+ states.
- Revolution grower take-back: Private-sector US program that collects ag film and net wrap, then recycles into new bags, mulch, and contractor-grade trash bags. Coverage is regional, strongest in dairy states.
Coverage in the US is uneven. Check with your county extension office or state department of agriculture before assuming a drop-off is available locally.
2. Landfill (acceptable — not preferred)
HDPE is inert in a landfill: it does not leach toxins, generate methane, or break down into microplastics on any short timescale. The carbon footprint of landfill disposal is roughly 0.02–0.04 kg CO₂e per kg (truck transport plus landfill operation), much smaller than the production footprint. Landfill is the default when recycling isn't available and is environmentally acceptable — just not the best path.
3. On-farm burning (avoid)
Burning HDPE in open piles produces partial combustion products including dioxins and microplastic ash. Most state air-quality rules prohibit it. The carbon math is worse than landfill because of the methane and CO from incomplete combustion.
What not to do: leave it in the field
Net wrap fragments left in a feeding area break down into smaller pieces over years, get ingested by cattle (see cattle eating net wrap), and become a labor problem at clean-up. Pull and bag the wrap as bales are fed.
Biodegradable Wrap: What Claims to Verify
Biodegradable net wrap exists at commercial scale in Europe (Tama BioNet, Coveris Roxor). US adoption is limited. Three honest checks before paying the biodegradable premium:
- Test standard cited. Look for ASTM D5511 (anaerobic biodegradation, simulating landfill) or ASTM D5988 (aerobic, soil). Vague "biodegradable" language without a test standard is marketing.
- Timeframe and conditions. Many biodegradable polymers require industrial composting conditions (60°C+, controlled moisture) to break down in the cited timeframe. On-farm conditions are nothing like that. Real-world breakdown can take years longer than the claim.
- Field performance. Biodegradable wraps have lower UV tolerance than HDPE — they're designed to break down. For long-term outdoor storage that's the wrong tradeoff. For silage operations feeding within 90 days, the math can work.
Our biodegradable net wrap deep-dive goes through the current US-market options and which test standards each manufacturer cites.
What Operators Can Actually Move
- Switch from twine to net wrap if you're not already. Lower per-bale polymer mass and lower carbon per bale, and the storage-loss math is overwhelming.
- Choose net wrap with verified UV life. A wrap that lasts 12 months in the sun won't be left behind in the field as fragments — operators can pull it intact at feeding.
- Set up bag-as-you-feed. A grain bag or 55-gal drum at the feeding area, used wrap goes in, hauled out monthly. Solves both the ingestion risk and the eventual recycling/landfill question.
- Find the closest collection point. Cleanfarms (Canada), Revolution (US ag states), or state extension office. If a drop-off is within 30 miles, recycling is the right answer.
Inline photo: NIM 1910 Warp knitting machine by ClemRutter, licensed under CC BY-SA 4.0, via Wikimedia Commons.
