3. Climate change is real, so don’t waste food.

Thanksgiving is often celebrated as a day to break the deadly sin of gluttony. And while it’s nice to gorge out once in a while, it’s never a good idea to let good food go to waste just because your holiday spirit was bigger than your stomach—especially when our climate is in dire straits.

In total, it’ll take nearly a million barrels of oil to produce and ship all the turkeys Americans eat on Thanksgiving. What’s worse is that, in 2016, six million turkeys ended up in the trash, representing a waste of “an estimated 100 billion gallons of water—enough to supply New York City for 100 days,” according to the National Resources Defense Council.

So as doing some last minute grocery store runs, make sure you’re not overbuying for the sake of looking prepared.