In 1985 The US public and the US government were made aware about Global Warming through the GreenhouseEffect. Carl Sagan very eloquently testified before Congress, back then. Uncanny how accurately he predicted what we are seeing today.
In 1978 the executive management of Exxon was made aware of the Greenhouse Effect of burning gasoline on a large scale by its own scientists. The execs of Exxon did listen and act, back then, and wanted to morph Exxon from an “Oil company” to an “Energy company”. However when a new CEO took the reigns (who is now happily enjoying his retirement) Exxon went back to the “Oil Company” business model and started an unprecedented disinfomration campaign, trying to discredit climate scientists, slowing down the discussion and the necessary action by decades.
See: https://news.harvard.edu/gazette/story/2023/01/harvard-led-analysis-finds-exxonmobil-internal-research-accurately-predicted-climate-change/