In June 1973 during a hearing on the Watergate scandal erupting around President Richard Nixon, Sen. Howard Baker, a Republican from Tennessee, uttered the most famous words of his entire career: "What did the president know and when did he know it?" It turned out that Nixon knew a lot early on, and that led to his resignation from the presidency a little more than a year later.
Since then, a form of that question has become central in investigations of many high-profile scandals including public health calamities such as those related to leaded gasoline, chlorofluorocarbons, asbestos and tobacco. Regarding the emerging public health calamity surrounding microplastics, we now have an answer to that compound question courtesy of the Los Angeles Times which gives us the precise date and location: the New York Academy Of Sciences Meeting in New York City held on May 10 and 11 in 1974.
At that conference, the plastics industry learned about the dangers of microplastics to human and animal health from Gerhard Volkheimer, a German scientist presenting at the conference, who "showed that tiny bits of swallowed plastic PVC [polyvinyl chloride] could slip through the intestinal lining of animals and travel through the blood and lymph to the brain, liver and other internal body parts," according to the Times. We know that many of the attendees at the conference were from industry because afterwords they wrote memos to their colleagues—now public thanks to the Times—memos bearing a distinct tone of alarm.
1974—Keep that year in your mind as we examine a similar question for other public health calamities.