While 20th century architecture learned to control the climate of a building, the architecture of the 21st century needs to learn to cope with the climate of cities. Problems such as urban heat and air pollution need to be included in planning and design. Based on empirical realities in Cairo, Chongqing, Geneva and Santiago de Chile, the book underlines that the materiality and social practices attached to room heating, compound greening, street alignment or climate policies together form the tissue for contemporary urban climates. It interweaves socio-cultural with meteorological data and pioneers the new concept of "thermal governance" by linking architectural and technological as well as legal