OTTAWA — Steven Guilbeault, a high-profile climate activist and Liberal MP, resigned from Prime Minister Mark Carney’s cabinet on Thursday in a dramatic renunciation of the government’s new deal to support oil-rich Alberta’s proposal for a major pipeline to the west coast, two government sources confirmed to the Star.

The accord, inked earlier in the day at a chummy ceremony in Calgary, saw the federal government ditch or water down significant climate policies that Guilbeault oversaw and helped implement as environment minister under former prime minister Justin Trudeau.

One senior government source, who spoke to the Star on condition they aren’t named, said Guilbeault was going to release a resignation statement later Thursday.

Before entering elected politics, Guilbeault was a famed

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