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

The Center for International Environmental Law (CIEL) proposes a hybrid liability system for the Kyoto Protocol's emissions trading to bridge the gap between pure seller and buyer liability. The proposal centers on a 'commitment period reserve' based on projected emissions trajectories. Units surplus to this reserve are traded under seller liability, while those within the reserve are traded under a 'limited buyer liability' framework. This limited approach aims to prevent a 'domino effect' of non-compliance by restricting the invalidation of units only to those originating from Parties whose verified emissions exceed their gross adjusted assigned amount, thereby maintaining market liquidity and enhancing transparency.

• The proposed hybrid liability rule utilizes a commitment period reserve to determine whether assigned amount units (AAUs) are transferred under seller or buyer liability. Units that are surplus to the reserve are transferred under seller liability, while those that are part of 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 to reflect new inventory data and expert reviews.
• Under the proposed limited buyer liability system, invalidated AAUs are not returned to the issuer but remain in the acquiring Party's registry; they cannot be used for compliance until the originating Party remedies its excess emissions.
• The document argues that hybrid liability is superior to pure seller or buyer liability because it enhances compliance through performance tracking, provides buyers with portfolio flexibility, and increases transparency via public registries.

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} }