World Wildlife Fund, Washington

For half a century, World Wildlife Fund (WWF) has worked to protect the planet's natural environment and promote eco-friendly living. WWF has set a goal to conserve 15 of the world's most ecologically-important regions by the year 2020. The organization aims to achieve these goals in part by focusing its work on priority places—such as the Amazon, Coral Triangle, and Himalayas—and species—such as tigers, rhinos, and marine turtles. Its projects are rooted in science and extensive research, and five million WWF members around the world help enact them for the benefit of both humanity and the planet.

*No donation is necessary to enter or win, and a donation will not increase your chances of winning. To enter without donation, you must handwrite on a 3x5 card labeled "Project Runway Sweepstakes Entry," your full name, complete address, home and daytime telephone number (including area code), e-mail address and date of birth (all of which must be legible) and mail it with proper postage to: “Project Runway Sweepstakes Entry,” Groupon, Inc., 600 West Chicago Avenue, Ste. 400, Chicago, IL 60654. See Official Rules for additional requirements. Odds of winning depend on the total number of entries received. Void where prohibited by law. Sweepstakes only open to legal residents of the 50 U.S. or D.C., 18+. Entry period ends: 11:59 p.m. EST on 8/5/2014. ARV of prize: $4,644.23. Sponsor: Groupon, Inc., 600 West Chicago Avenue, Ste. 400, Chicago, IL 60654.