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Joe Oliver, the federal Natural Resources Minister, is pictured in Vancouver in March, 2013. Mr. Oliver has come under fire for climate-change comments that were made to La Presse newspaper in Montreal.DARRYL DYCK/The Canadian Press

Just as one federal cabinet minister is urging a more sophisticated tone to the climate-change debate, a second cabinet minister has found himself trying to prove he is not a climate-change denier.

Environment Minister Peter Kent this week said the federal government would never opt for a carbon pricing scheme itself, but would be open-minded about pricing arrangements set up by the provinces.

"We need to add a bit of subtle differentiation when we talk about carbon pricing," Mr. Kent said in an interview on Wednesday, adding that he and Alberta were on the same wavelength in taking action to significantly cut emissions.

But a day later, Natural Resources Minister Joe Oliver appeared to play down the urgency of fighting climate change.

In an editorial board meeting with La Presse in Montreal, Mr. Oliver cited scientists who say that fear of climate change has been exaggerated. His comments were confirmed through a transcription of that part of the meeting, provided to The Canadian Press on Friday by Mr. Oliver's spokesman.

"I did not say that there is no problem, and I do not say that others [scientists] have said that there is no problem. Instead, they say there is a big problem. But now they say that the problem is not so urgent that they previously thought. Maybe it will take more time," Mr. Oliver said, according to his spokesman. "But … I do not deny the problem, which is a fundamental problem."

Mr. Oliver was not able to cite any scientists at the time, but the minister's staff pointed to an article by climate-change skeptic Lawrence Solomon as well as quotes in The Economist and other publications from academics questioning whether the pace of global warming was slowing.

Mr. Oliver's comments took on a life of their own among environmentalists, who bombarded social media with comments questioning the Harper government's dedication to slowing global warming.

The minister is getting briefed by distorted media reports about climate change, said Keith Stewart, climate and energy campaign co-ordinator for Greenpeace Canada. He called Mr. Oliver's views "appalling" and "shocking."

They are a contrast in tone to that of Mr. Kent and Alberta Premier Alison Redford in Washington earlier this week. In separate appearances and meetings, Mr. Kent and Ms. Redford both stressed that Canada was taking climate change very seriously and that strong measures were in the works to reduce greenhouse-gas emissions in the oil and gas sector.

They need to persuade the American public that Canada is serious about emissions, in the hopes of winning U.S. regulatory approval to build the Keystone XL pipeline. The pipeline would carry Alberta bitumen through the United States down to the Gulf coast.

Gone was the federal talk about any form of carbon pricing being akin to a carbon tax that would raise the price of everything. Indeed, Mr. Kent took pains to stress that while Ottawa likes its regulatory approach to emissions, he was open to provinces setting up their own plans – as long as such arrangements lead to actual reductions in emissions.

"There hasn't been a great deal of subtlety in talking about carbon pricing. There are those carbon taxes where the revenues go into general revenue and do not guarantee the reduction of a single ton of greenhouse gases. [But] Alberta has a tech fund wherein their revenues are focused only, and in isolation, on technology to achieve further ghg reductions than the emitters in that province are already able to achieve."

Over the past six months, Conservative MPs have been relentless in their attack on any kind of carbon pricing regime, equating all such efforts to a "tax on everything."

But the pending new regulations on oil and gas emissions are pushing the federal government to recognize that provincial carbon pricing schemes are legitimate ways of fighting climate change, said Alex Wood, a senior director at the Sustainable Prosperity think tank in Ottawa.

"There's a certain theatre being played out in the House of Commons around these kinds of issues, and then there's the reality across the country. What you're getting is the [Environment] Minister saying carbon pricing is actually a reality in large parts of the country, and therefore as a national government we're not going to say it's a bad thing," Mr. Wood said. "That's a welcome development, that the government is creating the space for that kind of policy to be developed at the provincial level."

He did not comment on Mr. Oliver's interview, but tweeted earlier: "Min. Kent throws US consideration of #kxl (Keystone) a bone yesterday (not against carbon pricing). Min.Oliver takes it back today (no #climate change)."

As the Harper government heads into the latter half of its mandate, there is growing recognition among Conservatives that their rhetoric on the environment may need to shift.

Canada has committed to cutting its emissions to 17 per cent below 2005 levels by 2020, but so far only has measures to take the country halfway there. Most of those measures are provincial. In order to make up the other half, oil and gas regulations due to be published in coming months need to be quite stringent.

Federal officials have been negotiating with industry and Alberta officials for months, and have a general agreement on the framework but are still haggling over numbers. Provinces will have the leeway to design their own emissions regimes as long they meet the targets. And the federal government will not take any of the revenue collected by provinces through carbon pricing regimes.