As early as the late 1950s, tobacco companies knew that smoking could cause cancer, but they still spent decades funding scientific research to obfuscate that fact. Back in 1979, Exxon knew that fossil fuels were linked to global warming, but the oil industry disputed climate science for years. And now, a new report reveals that as early as the 1960s, the chemical industry knew that PFAS, so-called forever chemicals, had adverse health effects—and they went on to suppress that knowledge.