Global warming isn't happening, former Alaska Gov. Sarah Palin (R) argued over the weekend, pointing to the fact that it was snowing in Alaska in May.

"Global warming my gluteus maximus," she wrote in a post on her Facebook page , adding a small dose of politics to a picture of her youngest daughter Piper in the snow after graduation. "This is what 'Grad Blast' means in Alaska! We'll move our graduation b-b-q indoors and watch the mini-blizzard from 'round the fireplace."

Palin has been a reliable denier of climate science in the past. She's referred to studies supporting climate change models as "snake oil," and as a vice presidential candidate in 2008, she argued that humans haven't influenced changes in climate.

In her Facebook argument, Palin confuses weather with climate, a mistake frequently made by climate change deniers. Palin has made this blunder in the past , suggesting that local atmospheric conditions over short periods of time and small areas have bearing on larger trends averaged over long time periods and greater areas.

Palin's post comes as a new study shows global temperatures to be heating more slowly than previously thought, but at a rate that could still cause catastrophic damage if not addressed. From a Reuters report on the new research :

Extreme global warming is less likely in coming decades after a slowdown in the pace of temperature rises so far this century, an international team of scientists said on Sunday.

Warming is still on track, however, to breach a goal set by governments around the world of limiting the increase in temperatures to below 2 degrees Celsius (3.6 Fahrenheit) above pre-industrial times, unless tough action is taken to limit rising greenhouse gas emissions.