evidence: J. Murray Mitchell showed as early as 1963 a multidecadal cooling since about 1940.[1] At a conference on climate change held in Boulder, Colorado in 1965, evidence supporting Milankovitch cycles triggered speculation on how the calculated small changes in sunlight might somehow trigger ice ages. In 1966, Cesare Emiliani predicted that "a new glaciation will begin within a few thousand years." In his 1968 book The Population Bomb, Paul R. Ehrlich wrote "The greenhouse effect is being enhanced now by the greatly increased level of carbon dioxide ... [this] is being countered by low-level clouds generated by contrails, dust, and other contaminants ... At the moment we cannot predict what the overall climatic results will be of our using the atmosphere as a garbage dump."[3] [...] Present level of knowledge [edit]The concern that cooler temperatures would continue, and perhaps at a faster rate, has been observed to be incorrect, as was assessed in the IPCC Third Assessment Report of 2001.[6] More has to be learned about climate. However, the growing records have shown that short term cooling concerns have not been borne out. [...] Call it the Ice Age Fallacy. ... global cooling was much more an invention of the media than it was a real scientific concern. A survey of peer-reviewed scientific papers published between 1965 and 1979 shows that the large majority of research at the time predicted that the earth would warm as carbon-dioxide levels rose – as indeed it has.