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This article reports that Canadian-U.S. environmental relations manifest a growing importance of transborder state and provincial cooperation and policy-making. Under the joint Climate Change Action Plan, adopted by the New England Governors and the Eastern Canadian Premiers in August 2001, participating provinces and states commit to reduce greenhouse gas (GHG) emissions to 1990 levels by 2010 and 10 percent below 1990 levels by 2020. The provinces and states moreover pledge to ultimately decrease GHG emissions to levels that do not pose a threat to the climate, which according to an official estimate would require a 75-85 percent reduction from 2001 emission levels.