Explore a historical perspective on climate science through this 21-minute conference talk by Michael MacCracken at the AGU Chapman Conference. Delve into early climate research, policy aspects, and key figures like Harry Wexler. Examine the development of numerical weather prediction models, climate change studies, and the understanding of CO2's lifetime and the greenhouse effect. Trace the evolution of the carbon cycle concept, climate projections, and the role of the Atomic Energy Commission. Learn about influential workshops, including the WWF event, and the impact of Time Magazine coverage. Gain insights into the progression of Global Climate Models (GCMs) and draw valuable lessons from this comprehensive retrospective on climate science communication.