Today is Earth Day — one of the only days that people care about planet Earth. Companies are coming out in full force promoting their environmental and sustainability initiatives and the Canadian coffee war has once again found itself in a battle.

Starbucks Canada announced today on Twitter that “receive a free brewed coffee or tea when you use your reusable mug or tumbler.” That’s a reason to chug down their burnt coffee today and save a few bucks. Tim Hortons is also offering a discount, but it’s the same as everyday, with a 10-cent discount on beverages.