OTTAWA — Culture Minister Steven Guilbeault resigned from Prime Minister Mark Carney’s cabinet late Thursday to protest his government's new pact with Alberta on a proposed new pipeline.

The environmentalist and longtime climate activist was the face of the previous Liberal government's ambitious climate agenda for more than half a decade.

In a social media post Thursday, Guilbeault said he submitted his resignation to Carney that afternoon "with great sadness" — then spelled out his objections to the prime minister reversing many of the key environmental decisions made under the previous Liberal government.

"Despite this difficult economic context, I remain one of those for whom environmental issues must remain front and centre," he wrote. "That is why I strongly oppose the memorandum

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