Hybrid Liability Revisited: Bridging the Divide Between Seller and Buyer Liability

The Center for International Environmental Law (CIEL) proposes a hybrid liability rule for Article 17 emissions trading under the Kyoto Protocol to resolve disputes between seller and buyer liability. The proposal centers on a 'commitment period reserve' to ensure environmental integrity and market liquidity while preventing a 'domino effect' of non-compliance.

• CIEL proposes a hybrid liability system based on a commitment period reserve, where assigned amount units (AAUs) surplus to the reserve are transferred under seller liability, while those within the reserve are transferred under buyer liability.
• The commitment period reserve is established by projecting a five-year emissions trajectory based on prior inventories, which is then adjusted annually following emissions inventories and expert reviews.
• To prevent a 'domino effect' of non-compliance, CIEL suggests limiting the invalidation of buyer liability AAUs only to those originating from Parties whose verified emissions exceed their gross adjusted assigned amount.
• Under the proposed limited buyer liability, AAUs from a non-complying Party would be temporarily invalidated in the acquiring Party's registry rather than returned to the issuer, and cannot be used for compliance until the issuer remedies the excess emissions.
• The document argues that hybrid liability is superior to pure seller or buyer liability because it enhances compliance through financial incentives, provides buyers with portfolio flexibility, and increases transparency via public registries.
• CIEL previously proposed a 'traffic light' system but found it flawed due to a time lag in emissions reporting (up to two years), which could allow a Party to vastly over-sell before a 'yellow light' (buyer liability) was triggered.

APA

Center for International Environmental Law (2000). Hybrid Liability Revisited: Bridging the Divide Between Seller and Buyer Liability. https://www.ciel.org/wp-content/uploads/2015/03/HybridLiabilityCOP6.pdf

Chicago

Center for International Environmental Law. Hybrid Liability Revisited: Bridging the Divide Between Seller and Buyer Liability. 2000. https://www.ciel.org/wp-content/uploads/2015/03/HybridLiabilityCOP6.pdf.

Wikipedia

{{cite report |author=Center for International Environmental Law |title=Hybrid Liability Revisited: Bridging the Divide Between Seller and Buyer Liability |date=November 2000 |url=https://www.ciel.org/wp-content/uploads/2015/03/HybridLiabilityCOP6.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{centerforinternationalenvironmentallaw2000hybrid, author = {{Center for International Environmental Law}}, title = {{Hybrid Liability Revisited: Bridging the Divide Between Seller and Buyer Liability}}, institution = {Center for International Environmental Law}, year = {2000}, month = nov, url = {https://www.ciel.org/wp-content/uploads/2015/03/HybridLiabilityCOP6.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }