Understanding the Mechanisms that Facilitate Transition in Taxonomies

This report by the Climate Bonds Initiative analyzes how sustainable finance taxonomies incorporate transition mechanisms to support the shift to net-zero emissions by 2050. It identifies six key 'Taxonomy Transition Mechanisms'—including forward criteria, sunset dates, and transition plan requirements—and examines their application across traffic-light, binary, and mixed taxonomy archetypes. Through case studies of jurisdictions like Singapore, the EU, Australia, China, and Rwanda, the report demonstrates how these mechanisms can be used to provide granular, science-based criteria for hard-to-abate sectors, distinguishing between point-in-time 'transition labels' for financial instruments and the long-term 'transition process' of entities and sectors.

• The report identifies six 'Taxonomy Transition Mechanisms' used to facilitate and recognize the transition within classification systems: revision of criteria over time, forward criteria, shading, measures, sunset dates or phase-down guidelines, and transition plan requirements.
• Taxonomies are categorized into three main archetypes: traffic light (tiered/color-coded), binary (aligned or not aligned), and mixed (merging both models). Regardless of the archetype, most taxonomies use a combination of the six transition mechanisms to suit specific policy and market needs.
• The Singapore Asia Taxonomy utilizes a traffic-light structure with an 'amber' category for transitional activities. It specifically introduces 'amber measures'—component parts of transition like technologies or processes—to recognize partial improvements and early action even if the entire activity does not yet meet full transitional or sustainable criteria.
• The EU Taxonomy employs a binary system but tags certain activities as 'transitional' under Article 10(2) for those that lack technologically or economically feasible low-carbon alternatives. These are not given a separate 'transition' label for bonds, but can be included in green bonds under the EU Green Bond Standard.
• The Australian Sustainable Finance Taxonomy uses a mixed approach, incorporating 'decarbonisation measures' to help entities access finance for improving existing long-lived assets. These measures are reported as taxonomy-aligned capex or opex, but not as revenue, as they do not render the entire activity 'green'.
• The Rwanda Green Taxonomy uses a binary system but incorporates a transitional perspective through decarbonisation pathways and 'shading', where agricultural practices are categorized as beginner, intermediate, or advanced.
• China's 2025 Green Finance Endorsed Project Catalogue uses a binary 'pass or fail' approach and incorporates elements of transition activities based on the National Development and Reform Commission (NDRC) Guidance Catalogue for Green and Low-Carbon Transition Industry (2024 Edition).
• The report distinguishes between a 'transition label' and a 'transition process'. A label is a point-in-time market designation for a specific instrument (deal level), whereas a process is an entity or sector's decarbonization journey over time (system level) evidenced by strategy, capex, and targets.
• Capex is identified as a crucial metric for assessing the credibility of an entity's transition because it reveals where a company is investing for the future and whether its balance sheet supports or delays the transition.

APA

Boulle, B., & Rolla, I. P. (n.d.). Understanding the Mechanisms that Facilitate Transition in Taxonomies. Climate Bonds Initiative. https://www.climatebonds.net/files/documents/publications/Transitions-in-Taxonomies_EN.pdf

Chicago

Boulle, Bridget, and Isabella Piuzana Rolla. Understanding the Mechanisms that Facilitate Transition in Taxonomies. Climate Bonds Initiative, n.d. https://www.climatebonds.net/files/documents/publications/Transitions-in-Taxonomies_EN.pdf.

Wikipedia

{{cite report |last1=Boulle |first1=Bridget |last2=Rolla |first2=Isabella Piuzana |title=Understanding the Mechanisms that Facilitate Transition in Taxonomies |publisher=Climate Bonds Initiative |url=https://www.climatebonds.net/files/documents/publications/Transitions-in-Taxonomies_EN.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{boullendunderstanding, author = {Boulle, Bridget and Rolla, Isabella Piuzana}, title = {{Understanding the Mechanisms that Facilitate Transition in Taxonomies}}, institution = {Climate Bonds Initiative}, url = {https://www.climatebonds.net/files/documents/publications/Transitions-in-Taxonomies_EN.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }