The World Wildlife Fund, an environmentalist group that I first heard about when I bought a necktie from K & G in Atlanta. The tie was made or endorsed by them and had their logo on the back. From the group's website:
About WWF

Known worldwide by its panda logo, World Wildlife Fund (WWF) is dedicated to protecting the world's wildlife and wildlands. The largest privately supported international conservation organization in the world, WWF has more than 1 million members in the U.S. alone. Since its inception in 1961, WWF has invested in over 13,100 projects in 157 countries.

WWF directs its conservation efforts toward three global goals: protecting endangered spaces, saving endangered species, and addressing global threats. From working to save the giant panda, tiger, and rhino to helping establish and manage parks and reserves worldwide, WWF has been a conservation leader for more than 39 years.