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The Supreme Court of Canada has issued a landmark advisory opinion, ruling in a 5-2 decision that the federal Impact Assessment Act is largely unconstitutional. The majority found the legislation, which assesses major energy and infrastructure projects, oversteps federal authority by intruding into areas of provincial jurisdiction. The ruling is a significant victory for provinces like Alberta and Saskatchewan, which challenged the law, arguing it hindered resource development. The federal government must now revise the legislation, creating a period of regulatory uncertainty for major projects across the country.