John Wargo writes on Yale Environment 360:
Since 1950, plastics have quickly and quietly entered the lives and bodies of most people and ecosystems on the planet. In the United States alone, more than 100 billion pounds of resins are formed each year into food and beverage packaging, electronics, building products, furnishings, vehicles, toys, and medical devices. In 2007, the average American purchased more than 220 pounds of plastic, creating nearly $400 billion in sales.
It is now impossible to avoid exposure to plastics. They surround and pervade our homes, bodies, foods, and water supplies, from the plastic diapers and polyester pajamas worn by our children to the cars we drive and the frying pans in which we cook our food.
The ubiquitous nature of plastics is a significant factor in an unexpected side effect of 20th century prosperity — a change in the chemistry of the human body. Today, most individuals carry in their bodies a mixture of metals, pesticides, solvents, fire retardants, waterproofing agents, and by-products of fuel combustion, according to studies of human tissues conducted across the U.S. by the Centers for Disease Control and Prevention. Children often carry higher concentrations than adults, with the amounts also varying according to gender and ethnicity. Many of these substances are recognized by the governments of the United States and the European Union to be carcinogens, neurotoxins, reproductive and developmental toxins, or endocrine disruptors that mimic or block human hormones.
Significantly, these chemicals were once thought to be safe at doses now known to be hazardous; as with other substances, the perception of danger grew as governments tested chemicals more thoroughly. Such is the case with Bisphenol-A (BPA), the primary component of hard and clear polycarbonate plastics, which people are exposed to daily through water bottles, baby bottles, and the linings of canned foods.
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