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Environment Minister Catherine McKenna is the latest to display this sense of righteousness in telling CTV’s Evan Solomon she can’t be bothered with people who don’t fully support her approach to climate change.

“I have no time for folks who are, like, you know, ‘we shouldn’t take action,’” she said during a spirited exchange.

“What do you mean you have no time?” Solomon countered. “You’ve gotta have time. Your job is to have time for folks who care about this issue and want to understand.”

Backpedalling, McKenna tried another approach: “No, I don’t have time for politicians who play cynical games about climate change … I don’t have time for politicians who pretend that climate change isn’t real.”

It was an excellent example of the Liberals’ faith in their moral infallibility, and the misleading politics they’re willing to engage in to defend that position. McKenna’s second kick at the can — claiming her beef is with fellow politicians who think climate change is a hoax — would be a fair point if there were a horde of Canadian leaders who hold that view. Unfortunately, while there may still be one or two holdouts, most of the discussion about climate change is over the measures deployed by governments like Trudeau’s, and whether they are likely to produce real improvement, or are mainly a cynical political ploy to raise cash on the back of public guilt.

Perhaps the most vociferous critic of the Liberal position has been Brad Wall, the recently-retired premier of Saskatchewan. Wall doesn’t question the reality of the issue or the need for action, he simply disagrees that a tax is the most effective means of dealing with it. And he has an excellent argument: there is lots of valid doubt as to effectiveness of carbon taxes. While pricing unquestionably has an impact on consumer habits, and a stinging carbon tax would no doubt encourage people to be more cautious, big uncertainties remain.