The Big Compost Experiment: Using citizen science to assess the impact and effectiveness of biodegradable and compostable plastics in UK home composting

Urban Farm DB summary

A citizen-science study invited 9,701 UK residents to test how biodegradable and compostable plastics actually degrade in home composting. Many items, including certified products, failed to fully break down; 60% of TUV OK Compost Home-certified items were still clearly visible afterward. The authors conclude home composting is not an effective or environmentally beneficial disposal method for these materials in the UK.

Only numbers and their conditions are stored, as structured data — never the source's own sentences. Metric and condition names stay in English, as coded.

• 55 %

  visible remains rate(compostable plastic degradation)

  Compost

  region

  UK

  method

  citizen science home composting experiment

• 34 %

  fully disappeared rate(compostable plastic degradation)

  Compost

  region

  UK

  method

  citizen science home composting experiment

• 60 %

  visible remains rate(tuv ok compost home certified products)

  Compost

  certification

  TUV OK Compost Home

  region

  UK

• 28 %

  fully disappeared rate(tuv ok compost home certified products)

  Compost

  certification

  TUV OK Compost Home

  region

  UK

• 46 %

  no certification labeling rate(compostable plastic labeling)

  Designn = 50

  region

  UK

• 14 %

  industrial only certification rate(compostable plastic labeling)

  Designn = 50

  region

  UK

• 902

  participants completed(citizen science experiment)

  Social

  region

  UK

  recruited

  9701

• 91 %↑ Increase

  participant separation rate(food waste separation)

  SocialControl: UK national average

  region

  UK

Direction of conclusions

Each author conclusion is recorded only as a coded direction per topic. Read the original for the conclusion itself.

• Compost / nutrient cycleContradictsWith caveats
• Policy and governanceMixedWith caveats