In the mid-1970s the evidence about the greenhouse effect and its effect to climate change was growing among the scientific community. Data showed a steady increase of CO2 (carbon dioxide) in the atmosphere during the twentieth century at a rate of 25 times the historical average. Scientists, influenced by the work of Callendar, Revelle, Suess and Keeling have started to wonder if the worming trend which was occurring in the twentieth century was indeed, due to industrial emissions of greenhouse gases like CO2. At the same time, they discovered that the biological productivity of the oceans was an important regulator of the way the CO2 built up in the atmosphere, and that the water vapour which had been found to be an important factor in the formation of clouds, could also play a role in the modulation of weather and climate. And as the questions multiplied, scientists were starting to realise that only an interdisciplinary research programme could provide the much needed answers.