Draft:Carbon Handprint
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Carbon handprint is a life cycle assessment-based indicator of the positive climate impact of a product, service or technology. It measures the greenhouse gas emissions a customer avoids by replacing an existing solution, known as the baseline, with the product being assessed. Results are expressed in carbon dioxide equivalents, the same unit used for the carbon footprint.
Whereas a footprint captures the burden a product causes and is ideally reduced towards zero, a handprint captures the relief it enables and has no upper limit. A defining principle is that reducing one's own emissions is not a handprint: a handprint arises only when an actor reduces the footprint of someone else.
The most widely used methodology was developed between 2016 and 2018 by VTT Technical Research Centre of Finland and Lappeenranta University of Technology, and published as a guide and a peer-reviewed article. It builds on ISO 14040/14044 for life cycle assessment and ISO 14067 for product carbon footprints.
Origin of the concept
[edit]The term handprint was introduced in 2007 in the context of the UNESCO education for sustainable development agenda, as a symbol for action that shrinks the human footprint. From 2013 onwards it was developed into a measurable metric, notably by Gregory A. Norris, whose Handprint-Based NetPositive Assessment frames handprints as any footprint-consistent change an actor causes relative to business as usual. The Finnish carbon handprint approach applies a narrower reading, counting only reductions achieved at other actors.
Calculation
[edit]Using the same functional unit, the carbon footprints of the two systems being compared are calculated and the difference taken:
- carbon handprint = carbon footprint (baseline solution) − carbon footprint (handprint solution)
A handprint exists only if the customer's footprint is smaller with the assessed product; the reduction is credited to the provider of that product. Because the choice of baseline strongly determines the result, the guide requires it to be justified and reported transparently, and recommends a critical review by a third party whenever comparative claims are made publicly.
In a published case study, a logistics vehicle in the Helsinki region switching from average diesel to renewable diesel made from used cooking oil was found to avoid roughly 21 tons of CO2 equivalent per year.[1] Such results are valid only for the specific customer, period and use pattern assessed.
Limitations
[edit]Quantifying a handprint requires two full life cycle footprints, and reliable data for the baseline system is often difficult to obtain. Results depend heavily on baseline choice, exclude rebound effects outside the studied system, and cannot readily be scaled up to markets or organizations. Because the metric is explicitly intended for marketing and stakeholder communication, there is a recognized risk of positive claims being presented without the context needed to interpret them; the method's authors stress that growing a handprint complements rather than replaces reducing one's own footprint.
References
[edit]- ↑ Grönman, K.; et al. (2019). "Carbon handprint – An approach to assess the positive climate impacts of products demonstrated via renewable diesel case". Journal of Cleaner Production. 206: 1059–1072.
Bibliography
[edit]- Pajula, T.; Vatanen, S.; et al. (2018). "Carbon Handprint Guide" (PDF). Espoo: VTT Technical Research Centre of Finland / LUT University. Retrieved 14 September 2026.
- Norris, G. A. (2013). "An Introduction to Handprints and Handprinting". In Gröschl, S. (ed.). Uncertainty, Diversity and the Common Good. London: Gower.
- Norris, G. (2015). Handprint-Based NetPositive Assessment (Report). Boston: Harvard T. H. Chan School of Public Health.
- Norris, G.; et al. (2021). "SHINE handprint methodological framework". International Journal of Life Cycle Assessment. 26: 528–542.
- Norris, G.; et al. (2021). "Sustainability Health Initiative for NetPositive Enterprise (SHINE) handprint methodological framework". International Journal of Life Cycle Assessment. 26 (3): 528–542. doi:10.1007/s11367-021-01874-5.
- "ISO 14044:2006 – Environmental management – Life cycle assessment – Requirements and guidelines". International Organization for Standardization.
- "ISO 14026:2017 – Environmental labels and declarations – Principles, requirements and guidelines for communication of footprint information". International Organization for Standardization.
- "ISO 14067:2018 – Greenhouse gases – Carbon footprint of products – Requirements and guidelines for quantification". International Organization for Standardization.