1 Cities and sea : 1 cities and vertical farming buildings 1 Cities in the 21st century : 1 Cities in translation : 2 Cities, Globalisation and Sustainability 1 Citizen competences in the professional training in the cities of Conception (Chile) and Barcelona (España) 1 citizen confidence and satisfaction 1 Citizen involvement in smart cities 1 Citizen Journalism and Public Sphere in the Information Society 1 Citizen knowledge, archaeological surveying, and enhancement of cultural heritage in rural areas, the case of Ulldemolins (Priorat, Tarragona)