Life Cycle Assessment: Wooden Clothespins — Excel Project

1Overview

What is the environmental impact of a single wooden clothespin? This Life Cycle Assessment (LCA) quantifies greenhouse gas emissions across the entire product life cycle—from raw material extraction in Malaysia, through processing and manufacturing in China, distribution to the Netherlands, use, and eventual recycling.

Total Footprint

0.024 kg

CO₂-eq

24 g

Weight

7 g

Ratio

3.5×

A clothespin weighs just 7 grams but generates 24 grams of CO₂-equivalent emissions over its lifetime—approximately 3.5 times its physical weight. This paradox highlights how material sourcing and logistics dominate environmental impact for lightweight products.

2Methodology

Following the Greenhouse Gas Protocol, the assessment uses a cradle-to-grave approach across four lifecycle stages:

Stage	Key Activities	Materials	Emissions
Sourcing	Extraction & mining	Birch wood (6g) + Steel (1g)	0.00209 kg
Processing	Cutting, drying, carving	Wood & steel preparation	0.013 kg
Manufacturing	Assembly (China)	Component integration	0.007 kg
Transportation	8 routes (Malaysia → China → Netherlands)	Marine & truck logistics	0.00189 kg

Functional unit: 1 wooden clothespin used for its entire lifecycle. Chemical composition data sourced from peer-reviewed literature with GWP values from the GHG Protocol 100-year assessment table.

3Results by stage

Processing dominates the footprint

The processing stage accounts for 54% of total emissions (0.013 kg CO₂-eq), driven by machinery energy for drying, cutting, and carving. Manufacturing adds 29%, sourcing 9%, and transportation 8%.

EMISSIONS BREAKDOWN BY LIFECYCLE STAGE

Transportation: 8 global routes

Despite its lightweight nature (7g), the clothespin travels across 8 distinct routes:

Route 1: Marine — Malaysia to China (2,740 km)
Routes 2–4: Domestic trucks within China (processing & manufacturing)
Route 5: Marine — Shanghai to Rotterdam (26,220 km)
Routes 6–8: Domestic trucks in Netherlands (distribution, sorting, recycling)

The intercontinental marine legs (Routes 1 & 5) account for the bulk of transportation emissions, yet remain modest due to economies of scale in container shipping (TEU loads).

4Key insights

      Finding 1: Processing dominates. For lightweight products, manufacturing energy consumption is the critical lever, not material sourcing alone.
    

      Finding 2: Global supply chains work for small items. Despite spanning Malaysia → China → Netherlands, containerized marine logistics keep transportation to just 8% of the footprint.
    

      Finding 3: Material choice matters, but manufacturing efficiency matters more. The steel spring (1g, high-emission source) contributes disproportionately to sourcing (9%), but is dwarfed by wooden component processing (54%).
    

For sustainable product design, the priority should be optimizing processing machinery energy efficiency, not just reducing material mass.

5View files

Explore the raw data and full analysis report:

6Conclusion

A single wooden clothespin, weighing just 7 grams, generates 24 grams of CO₂-equivalent emissions across its lifecycle. While the absolute footprint is tiny, the relative impact (3.5× its weight) underscores how manufacturing and logistics processes drive environmental impact more than material quantity.

This assessment demonstrates the value of LCA for identifying efficiency opportunities in global supply chains, especially for lightweight consumer products where operational energy often outweighs material extraction in environmental terms.