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Imperial, Canada's second-largest petroleum producer, said it was necessary to stop global warming,
A carbon price 10 times higher will be more cost effective than regulations and subsidies, a new report says.
The Ontario premier previously said hed move on once Canadians had their say at the ballot box.
Justin Trudeau reiterated the plan only raises the price until 2022.
The Liberals carbon tax and clean fuel standard will add 31 cents per litre to the price of gas, a new Conservative election ad claims.
The Ontario government is requiring every gas station in the province to display them.
Ontario should display the social and environmental costs of oil consumption at gas stations.