Abstract
When it comes to building, as with energy, the new doesn't make the old disappear. The extraordinary rise of concrete between 1950 and 2000, far from eradicating other building materials, allowed them to grow : glass of course, steel, wood, but also brick, which it competes with directly. Under the reign of concrete, every material finds its place. Because the city of the future (2050) will resemble that of the present to a fault, futurism is not a good guide when it comes to thinking about the climate challenge.
