TORONTO — Canadian Prime Minister Mark Carney and the premier of Canada’s oil rich province of Alberta agreed Thursday to work toward building a pipeline to the Pacific Coast to diversify the country’s oil exports beyond the United States, in a move that has caused turmoil in Carney's inner circle.

The memorandum of understanding includes an adjustment of an oil tanker ban off parts of the British Columbia coast if a pipeline comes to fruition.

Carney’s support for it led to the resignation Thursday of one of his cabinet ministers, Steven Guilbeault, a former environment minister and career environmentalist who has been serving as the minister of culture.

Guilbeault said in a statement he strongly opposes the agreement with Alberta, noting the pipeline could cross the Great Bear Rainf

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