"if Poilievre has a set of proposals that would achieve the same level of emissions reductions at a lower cost, he could always just present it. To date, he hasn't...Stephen Harper's Conservative government, argued that "Canadian conservatives shouldn't shy away from climate policy.".Harper himself called it "perhaps the biggest threat to confront the future of humanity today." https://www.cbc.ca/news/politics/climate-change-carbon-tax-poilievre-singh-1.7329954