Video from the U.N.E.D.: "Envejecimiento, longevidad y población"

This video, produced by the Universidad Nacional de Educación a Distancia (U.N.E.D.) is closely related with the Unit 1 ("Population", inside the Human Geography field) in our book. More accurately, it is about the demographic changes in Spain on the last four decades. It is actually an excellent complement in order to secure and to clear these contents.