Earlier this week, an Alberta newspaper published an op-ed by Nixon in which he called the new federal plan to reduce greenhouse gas emissions "insane."
In his letter, sent Friday, Guilbeault says Nixon misread a graph and got his facts wrong.
"I want to correct the record on what this plan does and does not do," he writes.
He backs that up with reference to numbers pulled from the federal document. He writes they prove the federal plan is an attempt to reduce oil and gas production and economic activity in Alberta that would destroy the province's quality of life.
That's not what the numbers say, wrote Guilbeault.
The reductions Nixon points to refer instead to the differences in projected production with and without the emissions reduction plan. The plan actually allows the oilpatch to increase output, he said.
"Oil production could grow by about one million barrels per day and emissions would remain aligned with Canada’s 2030 goal of 40 to 45 per cent reductions relative to 2005. The plan is focused on cutting the emissions."
Guilbeault points out the direction is shared by industry groups such as the Oilsands Pathways Alliance, a coalition of major oilsands producers.
@s_guilbeault asks Alberta minister @JasonNixonAB to 'correct' column on emissions reduction. #CDNPoli #ABPoli #ClimateChange
"Informed public debates cannot happen when fundamental facts are entirely mischaracterized by public officials," he wrote. "I respectfully request that you please correct the public record."
Nixon stood by his comments Friday.
"A production cut below projected growth is still a cut," he said in an email through his spokesman, calling the emissions caps a "masquerade."
This report by The Canadian Press was first published April 8, 2022.