Quantifying the relationship between the waste footprint and environmental impact of products

Sammanfattning: Despite the increasing public awareness about the waste that is created while consuming and disposing of products, the waste created by the raw material extraction and production phases is usually invisible to the consumers. In this respect, a product waste footprint indicator based on the life cycle perspective was recently proposed to address this knowledge gap, offering a better understanding of the environmental consequences of human consumption behaviour. Using product waste footprint as an environmental indicator would be limited in capturing the full suite of life cycle environmental damages associated with a product. On the other hand, the strict interpretation of life cycle assessment is quite technical, costly and ineffective for communicating with broader audiences. Therefore, there is still a need for simpler and less costly options, such as the product waste footprint, for environmental decision making and communication. The aim of this study is to find out if product waste footprint is a good proxy for the life cycle environmental impacts for different products. Data for 1400+ products from different product categories (agricultural, forestry, animal products; basic metal and alloys; chemicals; glass and other non-metallic products; machinery; ores, minerals and fuels; processed biobased products) were collected from the Ecoinvent 3.5 cut-off database using Brightway2 LCA framework. The results from linear regression analyses suggest that there is indeed a statistically significant and positive relationship between the product waste footprint and environmental damages to ecosystem diversity, human health, and resource availability. The regression models can explain up to more than 90% of the variance in environmental damages and they predict around 0.8% increase in environmental damages for each 1.0% increase in the waste footprints. The strong association between the waste footprints and environmental damage indicators suggest that the waste footprint is a strong candidate to be part of the environmental sustainability communication between product companies, customers and other decision makers in the product supply chains. While the waste footprint does not aim to replace other environmental indicators, it can be used to increase customer awareness on the invisible waste, influence consumption behaviour and to promote circular economy.