With Earth Day right around the corner, all kinds of corporations are looking to take advantage of the marketing power of ‘green’ by running some sort of promotion. Here’s some of the best of them:

Starbucks
The coffee behemoth is encouraging everyone to switch from paper cups to reusable travel mugs, and will give a free coffee tomorrow to anyone who brings in their own mug.

Equinox Fitness
On April 20, the upscale workout chain – voted “America’s Healthiest Gym” by Health magazine – will give free fitness sessions and organic cocktails, tea and snacks to members and anyone who stops by to inquire about becoming a member. They’ll also dispense tips on how to live green, and will plant a tree for every new member who joins that day.

Hanes
Get a free Earth Day tee, and contribute toward the planting of 20,000 trees, when you buy three Hanes products.

Service Experts
This heating and AC servicing company is running a sweepstakes in which visitors to their Web site can win prizes from a Ford Fusion Hybrid to having your energy bill paid for a year.

Purex
The laundry detergent line is attempting a green rebranding, and as part of that is giving away a $20,000 green home makeover. Just tell them what you’d do with the money and you’re entered to win.