This assay deals the process of collective denial, a mental block related with the confrontation of a person with subjects of high complexity, and the possibility that this process might be related with the delay of society to recognize the existence of the global climatic changes for more than 30 years. However, the collective denial now seems to be decreasing in a society with higher access to information. This new well informed society demands transparency and participation in the process of production and use of knowledge. During this century we will have to deal with a new form of making science which will possibly have a much more significant participation of society.