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OTTAWA — A move by the Conservatives to force the House of Commons to sit through the night as punishment for the government’s failure to say how much its carbon tax plan will cost Canadians is raising questions about how much the Liberals actually know about the household costs of carbon pricing.

On Thursday, a spokesperson for Environment Minister Catherine McKenna told the National Post the Liberals have not done a household impact analysis for the provinces, given that it’s still unclear how each jurisdiction will choose to price carbon.

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In April, the Liberals released a report estimating that a national carbon price could cut emissions by 80 to 90 million tonnes in 2022 without a significant impact on GDP, but the document doesn’t say how much households stand to be affected.

“It’s up to provinces to determine what they’re going to do, what their plan is and what they’re going to do with the revenues,” McKenna said Thursday. “There’s very different models but, until you have systems, you can’t do analysis.”