Reference re Greenhouse Gas Pollution Pricing Act
[2] In response to Canada's 2016 ratification of the Paris Agreement which set greenhouse gas emission reduction targets, the Canadian federal government under Prime Minister Justin Trudeau passed the Greenhouse Gas Pollution Pricing Act (GHGPPA), which came into effect on 21 June 2018, establishing national standards for a carbon price.On 3 May 2019 the Court of Appeal ruled in favour of the federal government, concluding that, GHGPPA is "not unconstitutional either in whole or in part"[6][7][8] and was a legitimate exercise of federal jurisdiction under the peace, order, and good government" (POGG) branch of the constitution (Justices Ottenbreit and Caldwell dissenting).On 28 June 28 2019, the ONCA issued its advisory opinion, finding the law constitutionally valid (Justice Huscroft dissenting).On February 24, 2020, that court issued an opinion which found the GHGPPA unconstitutional (Justice Feehan dissenting).The majority found the Act to be constitutional including Chief Justice Richard Wagner and Justices Rosalie Silberman Abella, Michael J. Moldaver, Andromache Karakatsanis, Sheilah L. Martin, and Nicholas Kasirer.