In a 6-3 decision, Canada’s high court has ruled the Trudeau government’s carbon pricing plan is constitutional.

Ottawa implemented the Greenhouse Gas Pollution Pricing Act in 2019, setting a minimum price on carbon emissions in provinces which don’t have equivalent prices.

The law was challenged by Ontario, Alberta and Saskatchewan.

Ontario’s environment minister expressed disappointment.

Jeff Yurek says in a statement that the government will respect the decision, but that the province will continue implementing its tough, but fair plan to hold large industrial emitters accountable.

The Ford government set aside $30-million to fight the federal carbon tax but a government spokesperson says it spent far less.

Ottawa says the ruling is a win for Canadians who believe in fighting climate change and building a prosperous economy.

Writing for the majority, Chief Justice Richard Wagner points out Ontario, Alberta and Saskatchewan are collectively responsible for more than two-thirds of Canada’s total greenhouse gas emissions.