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It's called "Crudeau Oil".

Greenpeace activists donning yellow vests, white hard hats, and orange overalls installed a pipeline bearing these words outside Canada House in London to coincide with Justin Trudeau's visit to the British capital.

Greenpeace says this was to remind the Canadian prime minister "that building tar sands pipelines threatens water, Indigenous rights, wildlife and climate health".

The media-savvy stunt came after the new premier of Saskatchewan, Scott Moe, has said that his province will table legislation similar to Alberta's Bill 12.

The Alberta legislation would purportedly allow the province to control exports of resource or cut off the export of resources to other provinces.

Alberta and B.C. politicians have publicly disagreed on whether Bill 12 is constitutional.

Attorney general David Eby has threatened to file a lawsuit if it's ever invoked to halt oil shipments to B.C.

Attorney General David Eby says it's unconstitutional for Alberta to discriminate against B.C. with oil exports.

In an essay called "There's dumb and there's Alberta dumb—Rachel Notley's Bill 12 is both", Straight contributor Martyn Brown highlighted the wording of section 92(a) of the constitution, which is Canada's supreme law.

It states:

“Export from provinces of resources:

“(2) In each province, the legislature may make laws in relation to the export from the province to another part of Canada of the primary production from non-renewable natural resources and forestry resources in the province and the production from facilities in the province for the generation of electrical energy, but such laws may not authorize or provide for discrimination in prices or in supplies exported to another part of Canada.

“Authority of Parliament

“(3) Nothing in subsection (2) derogates from the authority of Parliament to enact laws in relation to the matters referred to in that subsection and, where such a law of Parliament and a law of a province conflict, the law of Parliament prevails to the extent of the conflict.”

Brown, the long-time chief of staff to former B.C. premier Gordon Campbell, declared that if provisions in Bill 12 were invoked to discriminate in the export of oil and gas to B.C., that would be "explicitly forbidden by Canada's highest law".

If he's right and if Moe proceeds with his planned legislation, perhaps the title of Brown's last column should be reworded to include the words "Saskatchewan dumb". Or, for that matter, "dumb and dumber".

One thing is certain: Greenpeace's actions today show that Trudeau will continue to be mocked on foreign trips as he considers using billions in tax dollars to prop up Kinder Morgan's Trans Mountain Pipeline Expansion project.

This idea has been condemned by everyone from the Canadian Taxpayers Federation to left-wing author Naomi Klein to B.C. Green party leader Andrew Weaver.