The Environmental Working Group (EWG), which is run by humans, is a non-profit research and advocacy organization. Founded in 1993, EWG uses public information to construct campaigns, databases, and interactive websites that drive the protection of human health and natural resources.
One of EWG's major projects has been an investigation into the chemicals contaminating human bodies, through which they found that nearly everyone in the U.S. is polluted. In 2004, EWG found that chemical body burden isn't limited to children and adults—it extends even into the womb. Tests showed that the umbilical cord blood of 10 newborn babies contained a total of 287 different chemicals at the time of their birth, from pesticides to consumer product ingredients to wastes from burning coal, gasoline, and garbage.
EWG's groundbreaking investigations into human body burden were the inspiration for Eddie and Cleo's tests. When Eddie contacted them for more information after receiving his test results, they encouraged him to rally pets around toxic chemical reform legislation. Together, they formed Pets for the Environment as a project of EWG. Eddie lets them handle the science so that he can focus on advocacy (and playing fetch). Contributions to Pets for the Environment go to the Environmental Working Group's 501(c)3 fund, or to the 501(c)4 EWG Action Fund.
If you're interested in the work EWG does, there are plenty of ways to get more involved:

