Imagine if a persistent, toxic chemical was being added to all sorts of products you use everyday: soap, toothpaste, cosmetics, shaving cream, even toys and underwear. Imagine being told that it was put there to keep you safe from disease, when in reality it could end up making you sicker by contributing to antibiotic resistance. Imagine your food was being grown in fertilizer contaminated with this chemical, and that government tests found it in 75% of Americans. Finally, imagine you had an opportunity to do something about it.

Two studies came out in the last couple of weeks that really illustrate the problems associated with "PBT" chemicals: those which are simultaneously persistent, bioaccumulative, and toxic. Persistent substances resist degradation — you can move them around but it's really hard to get rid of them. Bioaccumulation happens when chemicals in food, water, and air end up getting stored in the body of a living thing. Thus, for a bass living in a mercury polluted lake, the mercury levels in the fish may be thousands of times higher than the levels in the water. A cow grazing on PCB-laced feed will store the chemical in her body and excrete it in her milk, and humans too act as sinks for all kinds of chemicals.