Starbucks is giving away a cup of free coffee or tea on Friday in celebration of Earth Day.

According to a post on the company's website, a person who brings in a reusable mug or tumbler gets a free brewed coffee or tea. The tea can be hot or iced.

For people who don't have a travel mug or leave theirs at home and don't want to buy a new one, they can ask for a "for here" cup and Starbucks will pick up the tab.

During last year's promotion, more than 1.2 million people participated, the company said.

There are two Starbucks in University City:

Starbucks Coffee in the Loop: 6621 Delmar Blvd.

Starbucks Coffee at corner of Delmar and North and South: 7640 Delmar Blvd.