Understanding Climatic Change - A Program for Action is a 1975 report by the US Committee for the Global Atmospheric Research Program. Already at this time, it was understood that a climate change was taking place, and that it was possibly happening due to human influences. The report gives an overview of past climates, a projection of future climate; it talks about state-of-the-art simulations and lays out a plan for future research and action. (summary by Ava)