Washington Signs Historic Carbon Market Linkage With California and Quebec

Washington Governor Bob Ferguson signed a carbon market linkage agreement with California and Quebec on June 25, 2026, in Seattle -- a major step toward creating the world's largest subnational carbon market. The linkage will let regulated businesses across all three jurisdictions trade emissions allowances and offset credits under a common auction and price, giving Washington's Climate Commitment Act cap-and-invest program access to the deeper California-Quebec market. Officials expect the linked market to become fully operational in 2027, pending remaining regulatory steps in California and Quebec. Ferguson called it 'a historic milestone in our climate partnership' at a moment when the US federal government has stepped back from climate policy.