Earth Day has certainly become more commercial since it was first celebrated on April 1970. Now companies, retailers and associations are all taking part. When done well, an Earth Day promotion can certainly help increase brand awareness and loyalty.

Check out a few Earth Day promotions that are engaging consumers AND putting a few greens back their pockets.

National Parks: Get into the 394 National Parks for free on Earth Day.

Starbucks and Caribou: Get a free basic coffee/tea at both retailers when you bring your own reusable mug.

Origins: Bring an empty cosmetic container to your local store and get a free full-size Origins cleanser.

Office Depot: Bring a used writing utensil for vouchers off new merchandise. The used pencils, pens and markers will be sent to TerraCycle, which will turn them into new office supplies.

Radioshack: Get a chance to win an eco-friendly car. When you trade in and recycle used electronic devices, you’ll be entered into the drawing for an electric Nissan LEAF and receive money off a new product.

Disney Stores: Bring five plastic bags to a local Disney store and get a free usable tote.

Lowe’s: Is giving away a million trees.

What is your company doing to support Earth Day? Spread the word and share your campaign/promotion in the comments section.