In 2015, investigative journalists uncovered internal company documents showing that Exxon scientists have been warning their executives about “potentially catastrophic” anthropogenic (human-caused) global warming since at least 1977 (1, 2). Researchers and journalists have subsequently unearthed additional documents showing that the US oil and gas industry writ large—by way of its trade association, the American Petroleum Institute—has been aware of potential human-caused global warming since at least the 1950s (3); the coal industry since at least the 1960s (4); electric utilities, Total oil company, and General Motors and Ford motor companies since at least the 1970s (5–8); and Shell oil company since at least the 1980s (9).