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SUPREME COURT OF CANADA CITATION: Reference re Greenhouse APPEALS HEARD: September 22, 23, Gas Pollution Pricing Act, 2021 SCC 2020 11 JUDGMENT RENDERED: March 25, 2021 DOCKETS: 38663, 38781, 39116 BETWEEN: Attorney General of Saskatchewan Appellant and Attorney General of Canada Respondent - and - Attorney General of Ontario, Attorney General of Quebec, Attorney General of New Brunswick, Attorney General of Manitoba, Attorney General of British Columbia, Attorney General of Alberta, Progress Alberta Communications Limited, Canadian Labour Congress, Saskatchewan Power Corporation, SaskEnergy Incorporated, Oceans North Conservation Society, Assembly of First Nations, Canadian Taxpayers Federation, Canada’s Ecofiscal Commission, Canadian Environmental Law Association, Environmental Defence Canada Inc., Sisters of Providence of St. Vincent de Paul, Amnesty International Canada, National Association of Women and the Law, Friends of the Earth, International Emissions Trading Association, David Suzuki Foundation, Athabasca Chipewyan First Nation, Smart Prosperity Institute, Canadian Public Health Association, Climate Justice Saskatoon, National Farmers Union, Saskatchewan Coalition for Sustainable Development, Saskatchewan Council for International Cooperation, Saskatchewan Environmental Society, SaskEV, Council of Canadians: Prairie and Northwest Territories Region, Council of Canadians: Regina Chapter, Council of Canadians: Saskatoon Chapter, New Brunswick Anti-Shale Gas Alliance, Youth of the Earth, Centre québécois du droit de l’environnement, Équiterre, Generation Squeeze, Public Health Association of British Columbia, Saskatchewan Public Health Association, Canadian Association of Physicians for the Environment, Canadian Coalition for the Rights of the Child, Youth Climate Lab, Assembly of Manitoba Chiefs, City of Richmond, City of Victoria, City of Nelson, District of Squamish, City of Rossland, City of Vancouver and Thunderchild First Nation Interveners AND BETWEEN: Attorney General of Ontario Appellant and Attorney General of Canada Respondent - and - Attorney General of Quebec, Attorney General of New Brunswick, Attorney General of Manitoba, Attorney General of British Columbia, Attorney General of Saskatchewan, Attorney General of Alberta, Progress Alberta Communications Limited, Anishinabek Nation, United Chiefs and Councils of Mnidoo Mnising, Canadian Labour Congress, Saskatchewan Power Corporation, SaskEnergy Incorporated, Oceans North Conservation Society, Assembly of First Nations, Canadian Taxpayers Federation, Canada’s Ecofiscal Commission, Canadian Environmental Law Association, Environmental Defence Canada Inc., Sisters of Providence of St. Vincent de Paul, Amnesty International Canada, National Association of Women and the Law, Friends of the Earth, International Emissions Trading Association, David Suzuki Foundation, Athabasca Chipewyan First Nation, Smart Prosperity Institute, Canadian Public Health Association, Climate Justice Saskatoon, National Farmers Union, Saskatchewan Coalition for Sustainable Development, Saskatchewan Council for International Cooperation, Saskatchewan Environmental Society, SaskEV, Council of Canadians: Prairie and Northwest Territories Region, Council of Canadians: Regina Chapter, Council of Canadians: Saskatoon Chapter, New Brunswick Anti-Shale Gas Alliance, Youth of the Earth, Centre québécois du droit de l’environnement, Équiterre, Generation Squeeze, Public Health Association of British Columbia, Saskatchewan Public Health Association, Canadian Association of Physicians for the Environment, Canadian Coalition for the Rights of the Child, Youth Climate Lab, Assembly of Manitoba Chiefs, City of Richmond, City of Victoria, City of Nelson, District of Squamish, City of Rossland, City of Vancouver and Thunderchild First Nation Interveners AND BETWEEN: Attorney General of British Columbia Appellant and Attorney General of Alberta Respondent - and - Attorney General of Canada, Attorney General of Ontario, Attorney General of Quebec, Attorney General of New Brunswick, Attorney General of Manitoba, Attorney General of Saskatchewan, Progress Alberta Communications Limited, Saskatchewan Power Corporation, SaskEnergy Incorporated, Oceans North Conservation Society, Assembly of First Nations, Canadian Taxpayers Federation, Canada’s Ecofiscal Commission, Canadian Environmental Law Association, Environmental Defence Canada Inc., Sisters of Providence of St. Vincent de Paul, Amnesty International Canada, International Emissions Trading Association, David Suzuki Foundation, Athabasca Chipewyan First Nation, Smart Prosperity Institute, Canadian Public Health Association, Climate Justice Saskatoon, National Farmers Union, Saskatchewan Coalition for Sustainable Development, Saskatchewan Council for International Cooperation, Saskatchewan Environmental Society, SaskEV, Council of Canadians: Prairie and Northwest Territories Region, Council of Canadians: Regina Chapter, Council of Canadians: Saskatoon Chapter, New Brunswick Anti-Shale Gas Alliance, Youth of the Earth, Generation Squeeze, Public Health Association of British Columbia, Saskatchewan Public Health Association, Canadian Association of Physicians for the Environment, Canadian Coalition for the Rights of the Child, Youth Climate Lab and Thunderchild First Nation Interveners CORAM: Wagner C.J. and Abella, Moldaver, Karakatsanis, Côté, Brown, Rowe, Martin and Kasirer JJ. REASONS FOR JUDGMENT: Wagner C.J. (Abella, Moldaver, Karakatsanis, Martin and (paras. 1 to 221) Kasirer JJ. concurring) REASONS DISSENTING IN PART: Côté J. (paras. 222 to 295) DISSENTING REASONS: Brown J. (paras. 296 to 456) DISSENTING REASONS: Rowe J. (paras. 457 to 616) NOTE: This document is subject to editorial revision before its reproduction in final form in the Canada Supreme Court Reports. RE: GREENHOUSE GAS POLLUTION PRICING ACT IN THE MATTER OF References to the Court of Appeal for Saskatchewan, the Court of Appeal for Ontario and the Court of Appeal of Alberta respecting the constitutionality of the Greenhouse Gas Pollution Pricing Act, S.C. 2018, c. 12, s. 186 Attorney General of Saskatchewan Appellant v. Attorney General of Canada Respondent and Attorney General of Ontario, Attorney General of Quebec, Attorney General of New Brunswick, Attorney General of Manitoba, Attorney General of British Columbia, Attorney General of Alberta, Progress Alberta Communications Limited, Canadian Labour Congress, Saskatchewan Power Corporation, SaskEnergy Incorporated, Oceans North Conservation Society, Assembly of First Nations, Canadian Taxpayers Federation, Canada’s Ecofiscal Commission, Canadian Environmental Law Association, Environmental Defence Canada Inc., Sisters of Providence of St. Vincent de Paul, Amnesty International Canada, National Association of Women and the Law, Friends of the Earth, International Emissions Trading Association, David Suzuki Foundation, Athabasca Chipewyan First Nation, Smart Prosperity Institute, Canadian Public Health Association, Climate Justice Saskatoon, National Farmers Union, Saskatchewan Coalition for Sustainable Development, Saskatchewan Council for International Cooperation, Saskatchewan Environmental Society, SaskEV, Council of Canadians: Prairie and Northwest Territories Region, Council of Canadians: Regina Chapter, Council of Canadians: Saskatoon Chapter, New Brunswick Anti-Shale Gas Alliance, Youth of the Earth, Centre québécois du droit de l’environnement, Équiterre, Generation Squeeze, Public Health Association of British Columbia, Saskatchewan Public Health Association, Canadian Association of Physicians for the Environment, Canadian Coalition for the Rights of the Child, Youth Climate Lab, Assembly of Manitoba Chiefs, City of Richmond, City of Victoria, City of Nelson, District of Squamish, City of Rossland, City of Vancouver and Thunderchild First Nation Interveners - and - Attorney General of Ontario Appellant v. Attorney General of Canada Respondent and Attorney General of Quebec, Attorney General of New Brunswick, Attorney General of Manitoba, Attorney General of British Columbia, Attorney General of Saskatchewan, Attorney General of Alberta, Progress Alberta Communications Limited, Anishinabek Nation, United Chiefs and Councils of Mnidoo Mnising, Canadian Labour Congress, Saskatchewan Power Corporation, SaskEnergy Incorporated, Oceans North Conservation Society, Assembly of First Nations, Canadian Taxpayers Federation, Canada’s Ecofiscal Commission, Canadian Environmental Law Association, Environmental Defence Canada Inc., Sisters of Providence of St. Vincent de Paul, Amnesty International Canada, National Association of Women and the Law, Friends of the Earth, International Emissions Trading Association, David Suzuki Foundation, Athabasca Chipewyan First Nation, Smart Prosperity Institute, Canadian Public Health Association, Climate Justice Saskatoon, National Farmers Union, Saskatchewan Coalition for Sustainable Development, Saskatchewan Council for International Cooperation, Saskatchewan Environmental Society, SaskEV, Council of Canadians: Prairie and Northwest Territories Region, Council of Canadians: Regina Chapter, Council of Canadians: Saskatoon Chapter, New Brunswick Anti-Shale Gas Alliance, Youth of the Earth, Centre québécois du droit de l’environnement, Équiterre, Generation Squeeze, Public Health Association of British Columbia, Saskatchewan Public Health Association, Canadian Association of Physicians for the Environment, Canadian Coalition for the Rights of the Child, Youth Climate Lab, Assembly of Manitoba