Natural cooling techniques.

This paper is not intended as an exhaustive account of all the available natural cooling techniques, including an interminable list of references, the advantages and disadvantages of each technique, and their field of application. Rather, it is intended to present the perspectives of future research and the topics that should be covered within the frame of a European concerted action. Thus, it will concentrate on the main obstacles and faults that we feel exist in the current research, and subsequently on the measures that should be taken to correct this.