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How are California and Quebec carbon markets working together, and does this model apply to other regions?

September 21, 2026 SmarterMarkets · Dirk Forrister

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California and Quebec operate in tandem through the Western Climate Initiative framework, a collaborative system where states co-design emissions trading programs with shared vision and comfort about trading partners' ambition levels. This represents a shift from older hub-and-spoke models like the Kyoto Protocol, allowing states to opt in or out while maintaining unified standards.

The partnership emerged after states borrowed concepts from the Regional Greenhouse Gas Initiative (RGGI) in the northeast, which demonstrated how multiple jurisdictions could link carbon markets effectively. California and Quebec took this model and refined it into something more flexible and participatory.

What sets the Western Climate Initiative apart is its emphasis on designed ambition rather than aspirational targets. As detailed in this episode on carbon market evolution, the system prioritizes serious targets embedded in law with clear enforcement mechanisms, rather than voluntary commitments that carry no penalty for missing goals.

From Hub-and-Spoke to Collaborative Networks

The older Kyoto Protocol relied on a centralized hub structure where countries deferred to a single authority. The Western Climate Initiative inverted this logic: instead of top-down control, states retain design autonomy while adhering to common architectural principles. Each jurisdiction can tailor its carbon price curve and compliance timeline to local conditions, but all partners operate under compatible rules.

This flexibility matters because carbon markets require trust between trading partners. States need confidence that their neighbors' emissions reductions are real and verifiable. As Dirk Forrister explains in the episode, the collaborative approach allows regulators to inspect each other's programs before linking, building mutual comfort around enforcement standards.

Applicability Beyond North America

The Western Climate Initiative model is already influencing carbon market design globally. Other regions evaluating their own emissions trading systems are studying how California and Quebec manage inter-jurisdictional trading and compliance harmonization. The principle—that states or regions can remain independent while linking through shared protocols—resonates in contexts from Europe's expanding ETS frameworks to emerging systems in Asia and Africa.

However, the model requires specific preconditions: participating jurisdictions must have comparable regulatory maturity, transparent monitoring systems, and political will to enforce penalties. Regions lacking these capacities may find the Western Climate Initiative approach difficult to replicate without significant institutional building first.

"We want serious targets that people will stick to, that are embedded in law, that allow flexibilities so that we can really achieve the objectives of the Paris Agreement."

The challenge ahead involves scaling this collaborative model. As discussed in the broader podcast conversation, California's emissions trading program recently extended its targets to 2045, raising questions about whether Quebec and other potential partners will align their long-term ambition, or whether diverging timelines will fracture the link.

See also