By the late 70s wasn't a secret, it's more that nobody would listen over the sound of oil prices crashing half a decade later. Exxon even briefly had a substant

By the late 70s wasn't a secret, it's more that nobody would listen over the sound of oil prices crashing half a decade later. Exxon even briefly had a substantial research division into renewables. In the 80s! YouTube channel Climate Town has a very good summary of history of early climate chance action, The Time America Almost Stopped Climate Change https://www.youtube.com/watch?v=MondapIjAAM https://www.youtube.com/watch?v=MondapIjAAM