OTTAWA — Culture Minister Steven Guilbeault has resigned from Prime Minister Mark Carney’s cabinet to protest Ottawa signing an agreement with Alberta on a proposed new pipeline.

In a social media post Thursday, Guilbeault said he submitted his resignation to Carney Thursday afternoon “with great sadness.”

“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 of understanding between the federal government and government of Alberta.”

The environmentalist and longtime climate activist — who said he intends to stay on as a Liberal MP — has been a key fixture in the Liberal government for the past six years, and was also serving as Carney’s Quebec lieutenant.

Guil

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