Atmospheric environmental chemistry in the 1980s is today's topic. First is Jonathan Shanklin and his discovery of the ozone hole, which led in a very short time to the Montreal Protocol, perhaps the most successful international treaty ever. Second we hear about Guy Callendar's and Charles Keeling's research showing how carbon dioxide we put into the atmosphere causes global warming--and how major petrochemical companies lied and gaslit the public in the 1980s about it.