Are you guilty of chucking aside the sweaters your granny gives you every winter? The Canadian arm of World Wildlife Fund wants you to be a dear and dig those dusty jumpers out of your closet for National Sweater Day on February 9. Sponsored by Loblaw, the Great White North’s largest food retailer, the event is part of a nationwide movement to encourage Canadians to turn down the heat and “turn up a sweater,” instead. Lowering your thermostat by just one degree throughout the year will reduce your carbon-dioxide emissions by 100 kilograms—that’s 220 pounds for the non-metrically inclined—or the weight of a baby hippopotamus, according to WWF-Canada. Need a little friendly prodding? Book a call with one of the dozen actual grannies who are standing by to nag remind you.

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Residential heating is a major contributor to climate change, according to WWF-Canada. If every Canadian turned down their thermostat by two degrees Celsius each winter, 2.2 megatons of carbon dioxide could be saved every year—the equivalent of taking 350,000 cars off the road.

If every Canadian turned down their thermostat by two degrees, it would save the carbon-dioxide equivalent of taking 350,000 cars off the road.

“National Sweater Day is a fun and easy way for Canadians to show that they value energy and want to use it wisely, not wastefully,” says Josh Laughren, director of climate and energy at the nonprofit. “Energy conservation is a critical part of fighting climate change.” You don’t even have to be Canadian to take part. So go ahead, make a nana, oma, or po po—even if it’s not your own— happy. The planet will thank you.

+ National Sweater Day

+ World Wildlife Federation Canada