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OTTAWA — Prime Minister Justin Trudeau says the federal Liberal government will establish a “floor price” on carbon pollution of $10 a tonne in 2018, rising to $50 a tonne by 2022.

Trudeau is making the announcement as he kicks off a debate in the House of Commons over whether Canada should ratify the Paris accord on climate change.

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“Provinces and territories will have a choice in how they implement this pricing,” he said.

“They can put a direct price on carbon pollution, or they can adopt a cap-and-trade system, with the expectation that it be stringent enough to meet or exceed the federal benchmark.”

And should any province or territory not have either a carbon price or a cap-and-trade system in place by 2018, “the government of Canada will implement a price in that jurisdiction.”

The news also comes as provincial environment ministers meet in Montreal with federal counterpart Catherine McKenna to hash out an agreement over carbon pricing.